Channel spectrum

As atoms/cm. Also shown is a channeled spectrum from a nonim-planted Si sample and a nonalignad, or random. Si spectrum. 

Fig. 3.50. RBS spectra of buried (5 -FeSi2 (full line) and /J-FeSi2 (dotted line) layers taken in a random direction. The <111 > channeling spectrum (circles) refers to the /J-FeSi2 layer [3.130],...

Figure 6b. Scattering spectrum for 2 MeV He on a W(100) crystal. represents the nonaligned spectrum, 100 the (100) channeling direction spectrum. The dashed curve represents the channeled spectrum after hydrogen adsorption. (Reproduced, with permission, from Ref. 21. Copyright 1981, CRC Press.)...

In region C, front- and back-face reflection components interfere to give rise to the well-known oscillations, or channeled spectrum of a slab. 

Key top, a complete 500 channel spectrum from 240 spark discharges and bottom, spectra from consecutive single spark discharges. Emission lines /. Fe 292.66 nm 2, Mn 293.31 nm 3, Mn 293.93 nm 4, Fe 294.44 nm 5, Fe 294.77 nm 6, Mn 293.31 nm and 7, Fe 295.38 nm. SIT vidicon parameters (bottom) 20 ps/channel, Oprep scans, 5 readout scans, delta Y - 100, and readout scans triggered by spark fire trigger pulse. Sparks were fired at... 

Fig. 8.8. Backscattering and channeling spectrum for amorphous Si layer on (100) Si crystal, showing dechanneled levels below the amorphous layer...

OPUS differentiates between the Raman spectrum and the single channel spectrum. The single channel spectrum of the Stokes and anti-Stokes Raman scattering for a sulphur sample is shown in Fig. 4.4. Note that the abscissa here is expressed in absolute wavenumbers. Therefore, the exciting laser line appears at vl = 9394 cm and the bands at wavenumbers lower and higher than 9394 cm arise from Stokes and anti-Stokes Raman scattering, respectively. On the other hand, a standard Raman spectrum comprises the spectral range from 0 to 3500 cm. Load the file RAMAN SULPHUR and find out the difference between these two types of spectra. 

Let us illustrate this conversion. The Raman spectrum of diamond shows a sharp band at 1331 cm. Assuming RLW = 9394 cm this band appears at 8063 cm in the single channel spectrum. As another example. Fig. 10.25 shows both types of spectra for ethanol on the left there is the Raman spectrum over the range from 100 to 3500 cm and on the right the single channel spectrum between 5894 and 9294 cm . Notice that the spike at 9394 cm is due to the laser line. 

Figure 10.25. The Raman spectrum and single channel spectrum of ethanol. 

The wavenumber region and data point spacing, as well as the units of the x-axes will be taken from a single channel spectrum that is entered in the black-... 

Mertz signed The modified Mertz function is used, if the single channel spectrum is expected to contain negative contributions. 

Keep in mind that the transformation interferogram to spectrum always results in a single channel spectrum. Therefore, a calculated spectrum must be converted in a respective way. 

Again, it is advised that, if the interferogram is perfectly symmetric or perfectly antisymmetric, you should select the symmetric transformation. Define the data range used for the transformation on the Frequency Range page and start the transformation. The result is a single channel spectrum. In the case of an antisymmetric transformation only the real part of the single channel spectrum will be saved. 

In spectrum (a), the 2048 channel spectrum, corresponding to IkeV per channel, the peaks are barely... 

The fact that only 2000 channels are available is irrelevant as the spectra can be regarded as a 2000 channel slice of a 4096-channel spectrum - or 8192 or 16384 channel spectra, for that matter. What matters is the number of channels within a peak. These spectra were recorded at about 0.5 keV/channel and I deduced in Chapter 5, Section 5.5.2 that this is, in many respects, optimal for best peak area measurement precision. 

Note the total absorptions by water vapour bands in the single channel spectrum (left) and the discontinuity in the resulting absorption spectrum (right panel). See text and captions of Figures 6.1 and 6.2 for further details. 

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