Microwave spectroscopy of the HCCS and DCCS radicals in the vibronic excited states

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:437250

Tang, Jian; Saito, Shuji ^[1]

---

1. Graduate Univ. for Advanced Studies and Institute for Molecular Science, Okazaki (Japan)

The microwave spectra of the HCCS and DCCS radicals (X{sup 2}{Pi}{sub i}) in both CCS({nu}{sub 5}) and H(D)CC({nu}{sub 4}) bending vibrational states were observed in the frequency range of 160-400 GHz with a dc discharge of the C{sub 2}H{sub 2} (or C{sub 2}D{sub 2}) and CS{sub 2} gas mixture. The rotational transition series for the vibronic {sup 2}{Delta}{sub 5/2,3/2}({nu}{sub 5}), {mu}, {kappa}{sup 2}{Sigma}({nu}{sub 5}), {sup 2}{Pi}{sub 3/2}(2{nu}{sub 5}), {sup 2}{Delta}{sub 5/2}({nu}{sub 4}) and {mu}{sup 2}{Sigma}({nu}{sub 4}) states were assigned. The analysis of the effective molecular constants showed that the values of the {gamma}{sub eff} constants of the vibronic {mu}, {kappa}{sup 2}{Sigma} states were different from each other by 2-3 GHz, which could not be explained by the up-to-date Renner-Teller theory for a single bending mode. This abnormal Renner-Teller effect may be understood by a new vibronic interaction theory, which was developed herein, to consider the cross vibronic interaction between the two bending modes.

• OSTI ID: 437250
• Report Number(s): CONF-9606118--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ABSORPTION SPECTROSCOPY
DEUTERIUM COMPOUNDS
EXCITED STATES
MICROWAVE SPECTRA
ORGANIC SULFUR COMPOUNDS
RADICALS
VIBRATIONAL STATES