Assignment of high-lying bending mode levels in the threshold photoelectron spectrum of NH2: a comparison between pyrolysis and fluorine-atom abstraction radical sources

F Holzmeier; M Lang; I Fischer; P Hemberger; G A Garcia; X Tang; J-C Loison

doi:10.1039/c5cp02964c

Assignment of high-lying bending mode levels in the threshold photoelectron spectrum of NH2: a comparison between pyrolysis and fluorine-atom abstraction radical sources

Phys Chem Chem Phys. 2015 Jul 15;17(29):19507-14. doi: 10.1039/c5cp02964c.

Authors

F Holzmeier¹, M Lang, I Fischer, P Hemberger, G A Garcia, X Tang, J-C Loison

Affiliation

¹ Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany. ingo.fischer@uni-wuerzburg.de.

PMID: 26146367
DOI: 10.1039/c5cp02964c

Abstract

In this manuscript we present threshold photoelectron spectra (TPES) of the amidogen radical, NH2, recorded at two vacuum ultraviolet synchrotron radiation beamlines, the DESIRS beamline of Synchrotron SOLEIL and the VUV beamline of the Swiss Light Source (SLS). Amidogen radicals were generated by two different methods, (a) H-atom abstraction of ammonia in a fluorine microwave discharge flow tube and (b) flash pyrolysis of methylhydrazine and diphenylmethylamine. Due to the large geometry change upon photoionization from the bent neutral molecule NH2 (X[combining tilde] (2)B1) to the quasi-linear cation NH2(+) (X[combining tilde] (3)B1), significant activity in the bending vibration υ2(+) of NH2(+) (X[combining tilde] (3)B1) is observed in the TPES. Transitions into a large number of υ2(+), Ka(+) levels of the cation are resolved.