Session D11: Focus Session: Promises and Challenges in Chemical Dynamics III
2:30 PM–5:18 PM, Monday, March 13, 2006
Baltimore Convention Center Room: 303
Sponsoring Unit:
DCP
Chair: Laurie Butler, University of Chicago
Abstract ID: BAPS.2006.MAR.D11.10
Abstract: D11.00010 : Experimental and Theoretical Investigation of the Electronic Spectroscopy of H$_{2}$CN
4:42 PM–4:54 PM
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Abstract 
Authors:
Paul J. Dagdigian
(Johns Hopkins University)
Alexey Teslja
(Columbia University)
Michael Banck
Wolfgang Eisfeld
(Technische Universit\"{a}t M|"{u}nchen)
The electronic spectrum of H$_{2}$CN, recorded through cavity ring-down spectroscopy, is reported. The radical was prepared by 193 nm photolysis of monomeric formaldoxime vapor. Two diffuse features are observed in the 34800-35800 cm$^{-1}$ spectral range, along with the $A - X$ (1,0) band of the OH co-fragment. These are assigned as vibronic transitions to the ground and 2$b_{1}$ (umbrella mode) levels of the second excited, $^{2}A_{1}$ state from the ground $^{2}B_{2}$ state. Experimental and simulated rotational profiles of these bands agree extremely well with each other for an assumed type-B electric-dipole allowed $^{2}A_{1} \quad \leftarrow \quad ^{2}B_{2}$ transition appropriate to this transition. A theoretical investigation of the dissociation pathways for electronically excited H$_{2}$CN is also presented. The upper states of the observed bands cannot dissociated directly, but higher $b_{1}$ levels are above the excited-state dissociation limit.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.D11.10