software to fit optical spectra - Quantum Materials Group

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Name Type Description What if omitted XPos Integer Horizontal position of the left side (in The position is not screen pixels) changed YPos Text Vertical position of the top side (in The position is not screen pixels) changed Command name: AddChiSqTerm Description: adds the specified chi-square term to the fitting task Note: the chi-square term is defined by the pair Dataset-Model. The right quantity should be ascribed to the dataset when loading! Parameters: Name Type Description What if omitted DatasetNo Integer Number of the dataset No action is taken ModelNo Integer Number of the model No action is taken Weight Double The weight of the term Assumed to be 1.0 Command name: DeleteChiSqTerm Description: delete the specified chi-square term from the fitting task Note: the chi-square term is defined by the pair dataset-model. Parameters: Name Type Description What if omitted DatasetNo Integer Number of the dataset No action is taken ModelNo Integer Number of the model No action is taken Command name: Fit Description: starts the fitting process Note: there is no command to stop the fitting process. It will be stopped on the base of the termination criteria (see section 4.10.2). Parameters: Name Type Description What if omitted NumIters Integer The maximum number of iterations No limit on the number that will be performed of iterations is imposed 4.11.9. Loop macro commands The two loop commands allow to perform calculations in a cycle, for instance, to do the same data fitting for several temperature (or magnetic field) values. Command BeginLoop marks the beginning of the cycle; command EndLoop marks the end of the cycle. They Guide to RefFIT Page 92
always come in pairs. All commands enclosed between BeginLoop and EndLoop are executed in a cycle. The command BeginLoop has one text parameter “LoopFile”, which contains the name (with a path, if necessary) of the so-called loop file. The loop file instructs RefFIT on how to run the cycle. It is a text file, which has the same number of lines, as the desired number of cycle steps. Each line contains one or more words separated by space. The first word is the first cycle variable, the second word is the second variable and so forth. The cycle variables are used to modify text parameters of the commands in the cycle. If a text parameter contains combination “%1”, then it will be substituted by the first cycle variable. The combination “%2” is substituted by the second cycle variable etc. For instance, if the first cycle variable is “250”, then text string “C:\MYDATA\REFL_T%1.DAT” will become “C:\MYDATA\REFL_T250.DAT”. Such a substitution, for example, in the File parameter of the LoadDataset command will cause the loading of a different dataset on each cycle step. Guide to RefFIT Page 93
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Last updated: 20.04.2004 Guide to R
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4.8. Dataset manager ..............
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that time. The later development of
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1.4. Let’s keep in touch Please,
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2.1.1. Levenberg-Marquardt algorith
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Guess initial parameters p , , p 1
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achieve a proper ‘balance’ betw
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The third requirement is that at ve
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Equation 2-19 is useful to estimate
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The first problem is that the Loren
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The problem can be circumvented by
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In these cases the fitting of the d
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3. Tutorial This chapter shows how
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Figure 3-3 Graph contents window is
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Figure 3-7 Click the button and in
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If you are still far from this fitt
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Figure 3-15 The model and experimen
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Figure 3-18 The “Graph properties
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Figure 3-20 Loading the reflectivit
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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
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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
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Page 79 and 80: At each iteration a linear equation
Page 81 and 82: Before a macro is actually executed
Page 83 and 84: Quantity Text Abbreviation of the q
Page 85 and 86: Parameters: Name Type Description W
Page 87 and 88: “Wp” - plasma frequency; “G
Page 89 and 90: ShowLine Integer =12: Chalk =13: Br
Page 91: XMin Double Minimal X (frequency) v
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software to fit optical spectra - Quantum Materials Group

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