State-selective dissociation of acetylene isotopomers

R. P. Schmid; Y. Ganot; Talya Arusi-Parpar; R.-J. Li; Illana Bar; Salman Rosenwaks

doi:10.1117/12.308414

15 May 1998 State-selective dissociation of acetylene isotopomers

R. P. Schmid, Y. Ganot, Talya Arusi-Parpar, R.-J. Li, Illana Bar, Salman Rosenwaks

Proceedings Volume 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV; (1998) https://doi.org/10.1117/12.308414
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

Rovibrational excitation combined with promotion of C₂HD/C₂H₂ molecules to the excited electronic trans-bent states A ¹A_u/B ¹B_u and photofragment ionization are used to generate action spectra and Doppler profiles. Rovibrational states of C₂HD and C₂H₂ are photodissociated by approximately 243.1 nm photons that also probe the H/D fragments. The yield of both H/D photofragments is greatly enhanced upon rovibrational excitation of both isotopomers. In the photolysis of C₂HD several couples of rotational transitions, terminating at the same upper rotational state, stand out from the rotational contour and the H/D branching ratio is rotationally state dependent. In C₂H₂ photolysis the transition intensities of the combination bands that involve high stretch and low bend excitation, (1410⁰2⁰) and (2031¹)⁰), are close to that of the fourth overtone of the C-H stretch, (2030⁰0⁰). In addition, in C₂H₂ some couples of rotational transitions stand out form the rotational contour, and the R(13) line of the (2030⁰0⁰) state shows anomalous intensity. The mechanism for the photoproducts preference in C₂HD and for intensity enhancement in C₂H₂ is discussed.

Citation Download Citation

R. P. Schmid, Y. Ganot, Talya Arusi-Parpar, R.-J. Li, Illana Bar, and Salman Rosenwaks "State-selective dissociation of acetylene isotopomers", Proc. SPIE 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV, (15 May 1998); https://doi.org/10.1117/12.308414

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available