The values of the binary absorption coefficient μ11 of oxygen in the region of the Herzberg photo-dissociation continuum (200-230 nm) at temperatures from 200 to 110 K are obtained for the first time. It is shown that the induced optical absorption spectrum of oxygen in the region from 200 to 230 nm is composed of two bands with significantly different temperature dependences of μ11: the binary absorption coefficient of the Herzberg III band increases by approximately 50% on cooling from room temperature to 110 K, while the other band shows no pronounced temperature dependence of μ11 in this temperature range. The μ 11(T) dependences are calculated theoretically using different functions M(r) of the induced transition dipole moment, namely, a function exponentially dependent on the intermolecular distance and a more complicated function accounting for both the short-range interaction and the long-range interaction due to quadrupole moments averaged over wave functions of various electronic states. It is found that the latter function M(r) better describes the temperature dependence of the Herzberg III oxygen absorption band in the whole temperature range studied and gives a physically justified value for the parameter r0 in the exponential part of the function.
|Number of pages||7|
|Journal||Optics and Spectroscopy (English translation of Optika i Spektroskopiya)|
|Publication status||Published - 1 Aug 2002|
Scopus subject areas
- Atomic and Molecular Physics, and Optics