Detection of vibration-rotational band 5-0 of12C16O X 1+ with cavity ringdown absorption near 0.96 μm

Chao Yu Chung, J. F. Ogilvie, Yuan-Pern Lee*

*Corresponding author for this work

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We have recorded extremely weak absorption in the overtone band 5-0 of 12C16O X 1+ near 0.96 μm with cavity ringdown spectroscopy; the light source was a Raman-shifted dye laser pumped with a frequency-doubled Nd:YAG laser. This band shows lines in branch P to be much more intense than corresponding lines in branch R, in contrast to all lower overtone bands v-0 (v = 1-4). This reversal in relative intensity is explained quantitatively in terms of a radial function for the electric dipolar moment of CO. We have estimated absorption line strengths for P3-P18 in band 5-0 of 12C16O; these strengths are consistent with a pure vibrational matrix element 〈5|p(x)|0〉 = (3.6 ± 0.3) × 10-36 C m of the electric dipolar moment p(x), a Herman-Wallis coefficient C0 5 of about -0.1, and a band strength of (5.1 ± 1.3) × 10-29 m at 293 K.

Original languageEnglish
Pages (from-to)7854-7858
Number of pages5
JournalJournal of Physical Chemistry A
Issue number35
StatePublished - 8 Sep 2005

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