The absorption spectrum of solid oxygen in the wavelength region from 12,000 Å to 3300 Å
Abstract
The electronic absorption band systems of oxygen with upper states 1Δ g, 1Σ g+, 1Δ g + 1Δ g, 1Δ g + 1Σ g+ and 1Σ g + 1Σ g+ were investigated in detail in the a form of the solid (~21°K); some data were obtained also for the β and γ modifications. Although the nineteen bands of α-O 2 studied exhibit great diversity in structure, the profiles show in general a rather sharp red edge and intensity degradation towards the violet. The over-all structure of each band is interpreted as the superposition of combination tones of the appropriate molecular frequency vm with continuous distributions of lattice frequencies; each distribution is more or less sharply peaked at v = vm + nvD ( n = 0, 1, 2, ⋯), where vD is the Debye frequency of the solid. The main component of the 0-0 band of each system corresponds to double phonon creation ( n = 2); for the higher members of each vibrational progression, single phonon creation ( n = 1) is more probable. Most of the subsidiary maxima correspond to less probable phonon transitions, i.e. with n not equal to the most probable value. The molecular constants ( Te', ω e', xe', ω e') derived from the analysis depart very little from the values for the free molecule.
- Publication:
-
Spectrochimica Acta
- Pub Date:
- January 1962
- DOI:
- 10.1016/0371-1951(62)80047-2
- Bibcode:
- 1962AcSpe..18....1L