Abstract

In a previous communication we gave the assignment of a number of weak Q-branches that were observed in the rovibrational Raman spectrum of natural CO_2. They were identified as such by the method of direct scanning of the purely isotropic part of Raman scattered light. Here we report Raman spectroscopic measurements of 99% enriched C¹⁸O₂ in the Fermi resonance region. In addition to the strong Σ- and II-diads of this isotopic species, again some weak Q-branches could be detected and assigned to essentially the same transitions as in ¹²C¹⁶O_2. Our experimental set-up has been described in detail elsewhere.

Sequence bands of the isotope ¹²C¹⁸O₂ laser

K. J. Siemsen
Opt. Lett. 6(3) 114-116 (1981)

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P. K. L. Yin
Appl. Opt. 8(5) 997-1006 (1969)

Absorption coefficients of chlorine-dioxide at ¹²C¹⁶O₂ and ¹²C¹⁸O₂ laser wavelengths: applications to remote monitoring in the working environment

Henrik Ahlberg, S. Lundqvist, and S. T. Eng
Appl. Opt. 23(17) 2902-2905 (1984)

Spectral measurements of high temperature ¹³C¹⁶O₂ and 13_C¹⁶O¹⁸O in the 4.3-μm region

Mark P. Esplin, Ronald J. Huppi, and George A. Vanasse
Appl. Opt. 21(9) 1681-1685 (1982)

Absolute intensity measurements of the (11¹0)_II ← 00⁰0 band of ¹²C¹⁶O₂ at 5.2 μm

Curtis P. Rinsland, D. Chris Benner, Donald J. Richardson, and R. A. Toth
Appl. Opt. 22(23) 3805-3809 (1983)