software to fit optical spectra - Quantum Materials Group

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Figure 3-5 In the “Graph properties” window one can modify the axis scales and titles. The playing around with parameters in an abstract model may start to get boring after a minute or so. To be more close to the real life let us load an experimental reflectivity curve. No doubt, you have your own beautiful spectra, but I would propose to take my own data file as a start. OK, we should open the dataset manager by clicking at “Dataset manager’ item of the “Window” menu. After that we get a window, shown at Figure 3-6. It has 10 slots for datasets. Figure 3-6 Dataset manager: no datasets are loaded yet. The rest is straightforward. Click the button in the first slot that will invoke the “Load Dataset” window (Figure 3-7). Guide to RefFIT Page 28
Figure 3-7 Click the button and in the “Browse” window pick up the master file ‘R1.DAT’ from the directory “TUTORIAL\PART1”. Click the button. The dataset will be loaded now to the first slot (Figure 3-8). Note that the program assumed that this file contained reflectivity by checking the first filename character – “R”. Sometimes the data type is determined incorrectly. If this happens, then you must choose the right quantity in the “Quantity” field. Figure 3-8 The dataset manager with a reflectivity dataset loaded into the first slot. You may close the ‘Dataset manager’ window in order to save some space on the screen. Don’t worry; it will not cause the unloading of our dataset. Guide to RefFIT Page 29
Page 1 and 2: Last updated: 20.04.2004 Guide to R
Page 3 and 4: 4.8. Dataset manager ..............
Page 5 and 6: that time. The later development of
Page 7 and 8: 1.4. Let’s keep in touch Please,
Page 9 and 10: 2.1.1. Levenberg-Marquardt algorith
Page 11 and 12: Guess initial parameters p , , p 1
Page 13 and 14: achieve a proper ‘balance’ betw
Page 15 and 16: The third requirement is that at ve
Page 17 and 18: Equation 2-19 is useful to estimate
Page 19 and 20: The first problem is that the Loren
Page 21 and 22: The problem can be circumvented by
Page 23 and 24: In these cases the fitting of the d
Page 25 and 26: 3. Tutorial This chapter shows how
Page 27: Figure 3-3 Graph contents window is
Page 31 and 32: If you are still far from this fitt
Page 33 and 34: Figure 3-15 The model and experimen
Page 35 and 36: Figure 3-18 The “Graph properties
Page 37 and 38: Figure 3-20 Loading the reflectivit
Page 39 and 40: Figure 3-22 The general RefFIT view
Page 41 and 42: Figure 3-25 The general RefFIT view
Page 43 and 44: MainWindow(XPos = 0, YPos = 0, Widt
Page 45 and 46: emarkable ‘anomaly’, related to
Page 47 and 48: ###################################
Page 49 and 50: # restores the original application
Page 51 and 52: 4. Reference 4.1. System requiremen
Page 53 and 54: Figure 4-2 The “Parameter control
Page 55 and 56: The model file stores information a
Page 57 and 58: considering multiple (Fabri- Perot)
Page 59 and 60: optical conductivity in practical u
Page 61 and 62: Kronig friendly, so be careful! “
Page 63 and 64: function. This command cannot be us
Page 65 and 66: Iinc Itrans ε ε ( 1) ( 2) … (n)
Page 67 and 68: In ellipsometry the complex ratio
Page 69 and 70: ` Figure 4-10 The experimental conf
Page 71 and 72: Here ω p and ∞ ε are considered
Page 73 and 74: points “#pts” and the grid type
Page 75 and 76: 4.9.2. Graph contents To set the gr
Page 77 and 78: Available ChiSq terms and click the
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At each iteration a linear equation
Page 81 and 82:
Before a macro is actually executed
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Quantity Text Abbreviation of the q
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Parameters: Name Type Description W
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“Wp” - plasma frequency; “G
Page 89 and 90:
ShowLine Integer =12: Chalk =13: Br
Page 91 and 92:
XMin Double Minimal X (frequency) v
Page 93 and 94:
always come in pairs. All commands
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software to fit optical spectra - Quantum Materials Group

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