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Infrared Multiple Photon Absorption of Silicon Tetra‐Fluoride and Anisole
Author(s) -
Haas Y.,
Citri O.,
Yahav G.
Publication year - 1984
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198400038
Subject(s) - chemistry , anisole , tetra , fluoride , infrared , silicon , absorption (acoustics) , photochemistry , inorganic chemistry , organic chemistry , medicinal chemistry , optics , catalysis , physics
The infrared multiple absorption probabilities of the title molecules are measured at two frequency ranges: one for which the single photon absorption (SPA) cross section is large (range I), and another for which it is much smaller (range II). For SiF 4 , the high power absorption probability in range I is much smaller than the SPA cross section. Collisions significantly increase the average number of photons absorbed. In range II, the absorption cross section increases upon increasing the laser fluence. For anisole, the same fluence effect is qualitatively observed, but it is less pronounced in range I. For anisole pressure exceeding 0.1 torr collisions with argon do not change the average number of photons absorbed per molecule. The 10.2 μ absorption in SiF 4 is suggested to be initiated by a single photon hot band absorption, followed by absorption in the quasi‐continuum (QC). QC absorption cross sections are in the range of (5–20) × 10 −21 cm 2 for both SiF 4 and anisole.