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Proceedings Paper

Diode Laser Spectroscopy Of Q Branches At 662-666 cm[sup]-1[/sup] of CO[sub]2[/sub] Enriched In [sup]18[/sup]O And 1[sup]7[/sup]0
Author(s): Herbert Flicker; Norris G. Nereson; W. S. Benedict
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Paper Abstract

Measurements have been made of the absorption of CO2 samples enriched in 18O and 17O by tunable diode lasers in the wave-number region 662.2-666.1 cm-1. The fundamental Q-branches of the 16O12C18O, 7 16O12C17O and 17O12C17O molecules are well resolved, together with "hot" Q branches and various R- and P-branch lines of other isotopic species; notably 18O12C18O and 17O12C16O. The molecular constants for the Q branch 0110 ← 00°0 of 16O12C18O have been calculated by a least mean-square fit to lines J=1 to 16 to be: vo = 662.3717 ± 0.0003 cm-1, ΔB = 9.65 ± 0.02 x 10-4 cm 1; where vo has been fixed in absolute magnitude by assuming the - 16O12C16O line, 0220 ←· 0110 P7, as a reference standard at 662.325 cm . More accurate values for ΔB and ΔD can be obtained by using the separation between several R lines and adjacent Q lines, and the known positions of the R lines relative to the origin to obtain: ΔB = 9.685 ± 0.002 x 10-4 cm 1 and ΔD = 2.2 ± 0.1 x 109 cm -1. Other molecular constants can be determined with highest precision by using low J-, R-, and P-branch lines as calibration standards, together with etalon spacing. The calculated line positions of the fundamental Q branch can be used as secondary standards to fit the hot bands.

Paper Details

Date Published: 13 November 1980
PDF: 5 pages
Proc. SPIE 0190, Los Alamos Conference on Optics 1979, (13 November 1980); doi: 10.1117/12.957756
Show Author Affiliations
Herbert Flicker, University of California (United States)
Norris G. Nereson, University of California (United States)
W. S. Benedict, University of Maryland (United States)

Published in SPIE Proceedings Vol. 0190:
Los Alamos Conference on Optics 1979
Donald H. Liebenberg, Editor(s)

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