Thermonicolet Omnic Software User's Guide 6.1 (PDF) - Charles E ...

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• It helps prevent infrared energy saturation, so the response of the detector is more linear. • It improves wavenumber accuracy and resolution by acting as a point source of infrared radiation. In general you will find that the larger the aperture, the better is the signal-to-noise ratio of the collected data. The smaller the aperture, the better the stability and accuracy will be. Small apertures are needed for high-resolution experiments. DTGS detectors can accommodate most of the energy from the source, which means you should use a large aperture size. Detectors that require cooling with liquid nitrogen are very sensitive and require a small aperture size or the use of an energy screen (see your system manual and Installing Hardware in the Help menu for more information on using energy screens). The table below lists recommended aperture settings for detectors with the correct energy screen installed. (See your system manual for more information on which screen to use for each detector type.) The settings in the table are based on the physical size of the detector elements and maximize the amount of infrared energy that reaches the sample. To correct linearity and photometric accuracy problems, you can reduce the setting, but you will pay a price in terms of signal-to-noise ratio. Detector DTGS MCT-A, MCT-B, InSb, PbSe, InGaAs or Si Setting 100 (30 for Mattson systems with an adjustable aperture) 32 (10 for an Avatar or Protégé system with the half-wavenumber option and for Mattson systems with an adjustable aperture) To change the size of the aperture opening, click the up or down arrow buttons at the right end of the Aperture text box. (On some systems, you can also type a value in the text box.) For Nexus systems with an adjustable aperture and for Magna-IR systems, the allowed values are 0 (minimum size) to 150 (maximum size). For Avatar and Protégé systems with the half-wavenumber option and for G Series systems with a two-position aperture, two settings are available: 10 and 100. The actual size of the opening is determined by the aperture installed in your spectrometer. Note Note For Nexus and Magna-IR systems, the setting of Aperture determines the area of the aperture opening. Doubling the setting approximately doubles the area. ▲ When collecting spectra at a resolution of 2 wavenumbers or higher (lower setting of the Resolution parameter), be sure to use the aperture setting shown in the table. A small aperture restricts the infrared beam and thus limits the band distortion that can occur at high resolutions when a large aperture is used. ▲ 124 Thermo Nicolet
Specifying the sample location Use Sample Compartment to specify the location of your sample. The setting determines the path of the infrared beam through the spectrometer and any accessory. The available settings depend on the configuration of the spectrometer and accessories. The possible settings are described in the following table. Setting Main GC Interface Right GC Interface Left Right µScope; %T Right µScope; %R Left µScope; %T Left µScope; %R Left AEM Right AEM Seaport Right TOM Left TOM Use this setting if... The sample is in the sample compartment of the spectrometer. You are performing a series experiment with the GC interface installed on the right side of the spectrometer. You are performing a series experiment with the GC interface installed on the left side of the spectrometer. You are performing a transmission experiment using a microscope installed to the right of the spectrometer. You are performing a reflection experiment using a microscope installed to the right of the spectrometer. You are performing a transmission experiment using a microscope installed to the left of the spectrometer. You are performing a reflection experiment using a microscope installed to the left of the spectrometer. The sample is in the sample compartment of an AEM installed to the left of the spectrometer. The sample is in the sample compartment of an AEM installed to the right of the spectrometer. The sample is in an external accessory to which the infrared beam is directed by the optional Seaport optics. You are using a TOM kit installed to the right of the spectrometer. You are using a TOM kit installed to the left of the spectrometer. Specifying the detector type Use the Detector parameter to specify the type of detector you will use for data collection. The available choices depend on the spectrometer and sample compartment you are using. Typically MCT detectors are used rather than DTGS detectors if the amount of infrared energy reaching the detector is small (and liquid nitrogen is available for cooling the MCT detector dewar). MCT detectors are also commonly used when a high mirror velocity is required; for example, in series experiments. OMNIC User’s <strong>Guide</strong> 125
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The information in this publication
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Peak area tool.....................
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Checking spectrometer performance a
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Process............................
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Selecting, editing or creating a re
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How to use this manual This manual
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• If you do not have the DS optio
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Note If you have the DS option, you
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Digital signature information in a
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There are several ways to enter the
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Note Some tutorials are available o
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Note If you are using Windows 2000
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Panes A pane is an area of the spec
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Displaying a list of spectrum title
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Displaying a different spectral reg
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Copying information to the Clipboar
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Note You can select all the display
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Next, hold down the Shift key and c
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Region tool Some OMNIC commands can
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You can position the annotation tex
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You can position the annotation by
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2. Click the Annotate button to the
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The corrected area is bordered by t
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2. Edit the label text if desired.
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Overlaying spectra lets you see sig
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When you hide a stacked spectrum, a
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If a pane containing a spectrum is
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46 Thermo Nicolet
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File Type Extension Comments Spectr
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The settings available in the Y Uni
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If Put Opened Spectrum In New Windo
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3. If the Save As dialog box appear
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2. Choose Save Group from the File
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2. Locate and select the desired fi
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Save a configuration This procedure
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A dialog box appears. 2. Type a use
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Note The Enable OMNIC Log-In comman
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Note If a spectrum has been pasted
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Delete files 1. Choose Delete Files
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When you cut a displayed stacked sp
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Pasting duplicate images of spectra
Page 84 and 85: Note The options you set using Opti
Page 86 and 87: File Type Initial Spectra Initial E
Page 88 and 89: Normalize the spectra of standards
Page 90 and 91: In the upper-left corner of the dia
Page 92 and 93: Type Annotation Axis Labels Axis Nu
Page 94 and 95: Specifying how to print axes The op
Page 96 and 97: Text Type Annotation Axis Labels Ax
Page 98 and 99: Note If you have turned off Prompt
Page 100 and 101: Setting Smart Purge The Smart Purge
Page 102 and 103: Specifying how to list peaks found
Page 104 and 105: 4. Collect a sample spectrum with n
Page 106 and 107: To specify or do this... The X-axis
Page 108 and 109: Turn on Display All Annotation if y
Page 110 and 111: Item Company Name Spectrum Title Da
Page 112 and 113: Preventing the overwriting of files
Page 114 and 115: State Enabled Disabled Hidden Descr
Page 116 and 117: 6. If you disabled or hid the Save
Page 118 and 119: 5. Specify the size of the toolbar
Page 120 and 121: Note You can create an image for a
Page 122 and 123: The experiment you select also sets
Page 124 and 125: Note The experiment you select also
Page 126 and 127: Note If you are studying samples th
Page 128 and 129: When deciding whether to use this f
Page 130 and 131: Titling the experiment Bench featur
Page 132 and 133: The peak-to-peak intensity is the s
Page 136 and 137: Specifying the beamsplitter type If
Page 138 and 139: The parameter checks appear when yo
Page 140 and 141: The individual checks are described
Page 142 and 143: Fringes result when back reflection
Page 144 and 145: A beamsplitter, detector, source or
Page 146 and 147: Type the desired minimum peak-to-pe
Page 148 and 149: Setting Boxcar N-B* Weak N-B* Mediu
Page 150 and 151: As an example, for a standard DTGS
Page 152 and 153: If you have installed a Smart Acces
Page 154 and 155: • Install a 32-bit version of OMN
Page 156 and 157: • To save the settings in the cur
Page 158 and 159: The positive settings move your vie
Page 160 and 161: What happens during collection? The
Page 162 and 163: 3. Choose Collect Sample from the C
Page 164 and 165: Note To store the spectrum on the h
Page 166 and 167: Viewing the age of the background D
Page 168 and 169: If Preview Data Collection is turne
Page 170 and 171: If at any time the system condition
Page 172 and 173: Undo a display limit change Choose
Page 174 and 175: To specify this or do this... The n
Page 176 and 177: To remove the grid from a spectral
Page 178 and 179: Note You can display annotations ve
Page 180 and 181: This format is suitable for high re
Page 182 and 183: Specifying the sampling information
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Stacked spectra Stacking spectra is
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Full Scale brings the highest data
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Match the Y-axis scale of a spectru
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Display spectra vertically offset 1
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Display spectra full scale automati
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Displaying and using a toolbar Use
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Converting spectra to absorbance Us
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The units are described in the next
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The photoacoustic value (PAS) at a
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Micrometers Select Micrometers to c
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4. Choose OK. • If you selected K
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• To change the final format. You
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What is a baseline? A baseline cons
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Important Be careful not to introdu
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The X and Y values of the point app
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8. When you are finished correcting
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Before searching an ATR spectrum ag
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• A spectrum includes the region
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Replacing a spectral region with a
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Subtracting spectra Use Subtract in
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2. Choose Subtract from the Process
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Subtracting a component or contamin
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Note If negative peaks appear in th
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3. Select the desired number of smo
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Converting spectra to their first o
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Multiplying a spectrum by a number
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Symbol Meaning Examples / Divide. A
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• To change the factor using the
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Here is the normalized spectrum: In
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Normalize the scale of spectra 1. S
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Example libraries The following sec
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Click the Print button in the Find
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6. To display or remove the Y-axis
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3. Choose Average from the Process
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Range of Y values versus X value Pe
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4. If you are not using the search
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Using extended search The Extended
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When you perform the search, the ex
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All the QC libraries and library gr
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Set up a spectral search (The proce
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7. Specify the number of found libr
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5. Specify the spectral regions to
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Search a spectral library 1. Use Li
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If you did not use the search exper
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To print the search expert’s comm
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Color-coded titles of the spectrum
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To print the spectrum and functiona
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You can choose Overlay Spectra from
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Working with libraries Click the Li
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Once a library is created, you can
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3. Click the name of the user libra
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A copy of the spectrum is placed in
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• If you are adding more than one
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3. Click the name of the library. T
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9. Choose Search. The search result
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The kinds of information displayed
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2. Click the Create/Edit Structures
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If you want to print the informatio
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When you are ready to start printin
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You can only add the spectrum to a
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3. If you want to reset the data co
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Follow these general steps to creat
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Type Spectrum Comments Spectrum Cus
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3. Specify the item type by selecti
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5. Choose Preview/Print Report from
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4. If the item type is Spectral Win
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The page number of the currently di
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7. Close the Report Template window
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Adding a report to a notebook Use A
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To view a report notebook, use View
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Searching for text Click the Search
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Express dates on this tab in the fo
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5. To search for reports that conta
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Note When windows are tiled, they m
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atmospheric effects suppressing, 94
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status of, 148 time for, 115, 116,
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detector interface kit, 123 detecto
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finding peaks, 235 fingerprint regi
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special criteria for, 246 spectral
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OMNIC Atlµs default directory, 76
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Process options, 90 Protégé spect
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experiment, 114, 146 default direct
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detector, 127 filter for, 139 for c
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displaying, 14, 20, 39, 95 color fo
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text adding to report template, 297
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x X-axis, 14, 17 display limits, 17
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Thermonicolet Omnic Software User's Guide 6.1 (PDF) - Charles E ...

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