Self-broadening

Cheville R A and Grioschkowsky D 1999 Far-infrared foreign and self-broadened rotational linewidths of high temperature water vapor J. Opt. See. Am. B 16 317-22... 

Rahn L. A., Palmer R. E. Studies of nitrogen self-broadening at high temperature with inverse Raman spectroscopy, J. Opt. Soc. Am. B 3, 1164-9 (1986). 

Perchard J. P., Murphy W. F., Bernstein H. J. Raman and Rayleigh spectroscopy and molecular motions. III. Self-broadening and broadening by inert gases of hydrogen halide gas spectra, Mol. Phys. 23, 535-45 (1972). 

It is possible to estimate the influence of the spectrometer on linewidth measurements by convolving the response function with a mathematical model of the line. The resulting curve may be compared with the observed line and the true width inferred. Hunt et al. (1968) have employed corrections of this type supplied by the author in their determination of carbon monoxide self-broadened linewidths. 

A detailed study of line intensities and self-broadening coefficients has been reported for of S02 (1088 - 1090 cm"1).642 UV irradiation of HONO/S02/X, where X = N2 or Ar, has been carried out. In N2, there was evidence for the HOS02 radical and HO(NO)S02. In Ar, only the latter is seen.643 DFT calculations were carried out to give vibrational wavenumbers for S02X2, where X = F, Cl or Br.644 Ab initio calculations gave vibrational wavenumbers for X-E02-NCO, where X = F, Cl, E = S, Se.645... 

The dephasing process originates from binary HC1 HC1, and for mixtures with Ar, also from HCl Ar collisions. Varying the pressure values of HCl and buffer gas, a linear dependence of 1/T2 o pressure has been observed as expected theoretically. For example, for the R(3) transition of neat HCl we find T2 p = 21.5 + 1 ps bar representing self-broadening via HC1 HC1 collisions. ... 

Pressure broadening was measured for the R16, R24 at R50 rotational transitions of the 17-2 vibrational band in the XL - B%(0 ) electronic transition of Br. Self broadening and foreigr gas brc dening were... 

Table I. Pressure broadening coefficients I for self broadening and II for broadening by helium.

Helium gave lower values for the broadening coefficients with smaller differences between the peak as compared to self broadening. This is not surprising as helium is less efficient in the orientation of the molecular angular momentum and less efficient in all the other processes as well. 

Movre, M. and Pichler, G., Resonant interaction and self-broadening of alkali resonance lines 1. Adiabatic potential curves, J. Phys. B Atom. Molec. Phys., 10, 2631, 1977. 

K. Niemax. G. Pichler Determination of van der Waals constants from the red wings of self-broadened Cs principal series lines. J. Phys. B 8, 2718 (1975)... 

During frequency-response experiments the main possible error and false factor sources were connected with technical vibrations and factors of possible nonradiational self-broadening of gamma radiation spectrum at the expense of preferential absorption in the resonance absorber on theway of direct gamma beam of quanta with energy most close to... 

The presence of extended collimator essentially lowered the possibility ofthe resonance detector being entered by that very small part of gamma quanta (with a small possible spectrum self-broadening) that were emitted by the source at a big angle from the direction to the detector. Such quanta, having passed the path in the resonance absorber volume greater than its optical width for the direct beam quanta, could be scattered in the resonant detector direction and lead to a very small additional broadening of the measured spectral line of radiation. 

HGM Edwards, DA Long, G Sherwood. Line widths in the pure rotational Raman spectra of hydrogen and deuterium self-broadened and broadened by foreign gases. J Raman Spectrosc 22 607-611, 1991. 

Transition X [nm] Self broadening Helium Width Shift Neon Width Shift Argon Width Shift Krypton Width Shift Xenon Width Width Nitrogen Shift Shift ... 

The pressure broadening of the sodium D line x = 589 nm by argon is 3xl0 /torr, equivalent to 30 MHz/torr. The shift is about minus 1 MHz/torr. The self-broadening of 150 MHz/torr, due to collision between Na atoms, is much larger. However, at pressures of several torr, the pressure broadening... 

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