Reinvestigating the tilde{A}-tilde{X} Spectrum of Ethynyl Radical: New Insights Into the Spectroscopy of ^2Π-^2Σ^+ Vibronic Bands

Details Reinvestigating the tilde{A}-tilde{X} Spectrum of Ethynyl Radical: New Insights Into the Spectroscopy of ^2Π-^2Σ^+ Vibronic Bands Reinvestigating the tilde{A}-tilde{X} Spectrum of Ethynyl Radical: New Insights Into the Spectroscopy of ^2Π-^2Σ^+ Vibronic Bands

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confetf11s&link_type=abstract

"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec

Physics

Radicals And Ions

Scientific paper

The ethynyl radical, C_2H, is an important reactive intermediate both in combustion processes, as it is readily formed in an acetylene (C_2H_2) flame, and in the chemistry of the interstellar medium, where it is suspected to be involved in the formation of longer carbon chain species (C_nH). We have recently interrogated several of the vibronic transitions to the low-lying excited tilde{A} state from the vibrationless level of the ground electronic state via high resolution infrared spectroscopy. This was done using direct absorption laser spectroscopy in a slit-jet discharge supersonic expansion of C_2H_2 diluted in a Neon/Helium gas mixture. In comparing our spectra with those already published using magnetic rotation spectroscopy, we find discrepancies between rovibronic frequencies in the 0_0^0 band at 3600 cm^{-1}. The inconsistency is localized in the excited state, by comparison of 2-line combination differences with mm-wave measurements of the ground state by Thaddeus and coworkers. Calculating the ^2Π energy levels using both Hund's case (a) and (b) basis sets and revisiting the analysis in the aforementioned work, we have determined that the discrepancies arise from a parity mislabeling of the lambda-doubled excited states. The improved low J signal intensities and resolution of satellite transitions that are observable under sub-Doppler, jet-cooled conditions complement the previous data and permit refinement of the rotational, spin-rotational, and lambda-doubling constants.
W. B. Yan, C. B. Dane, D. Zeitz, J. L. Hall and R. F. Curl, J. Mol. Spectrosc. 123, 486 (1987).
R. F. Curl, P. G. Carrick and A. J. Merer, J. Chem. Phys. 82, 3479 (1985).
T. C. Killian, C. A. Gottlieb and P. Thaddeus, J. Chem. Phys. 127, 114320 (2007).

Affiliated with

Also associated with

No associations

Rating

Reinvestigating the tilde{A}-tilde{X} Spectrum of Ethynyl Radical: New Insights Into the Spectroscopy of ^2Π-^2Σ^+ Vibronic Bands does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Reinvestigating the tilde{A}-tilde{X} Spectrum of Ethynyl Radical: New Insights Into the Spectroscopy of ^2Π-^2Σ^+ Vibronic Bands, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reinvestigating the tilde{A}-tilde{X} Spectrum of Ethynyl Radical: New Insights Into the Spectroscopy of ^2Π-^2Σ^+ Vibronic Bands will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1642421