Imaging the State-Specific Vibrational Predissociation of the C2H2−NH3 Hydrogen-Bonded Dimer

Autor:	Jessica Parr, Igor Fedorov, Guosheng Li, and Anthony J. McCaffery, Hanna Reisler
Rok vydání:	2007
Předmět:	education.field_of_study Population Rotational–vibrational spectroscopy Bond-dissociation energy chemistry.chemical_compound Recoil Acetylene chemistry Ionization Physical and Theoretical Chemistry Atomic physics education Ground state Excitation
Zdroj:	The Journal of Physical Chemistry A. 111:7589-7598
ISSN:	1520-5215 1089-5639
Popis:	The state-to-state vibrational predissociation (VP) dynamics of the hydrogen-bonded ammonia-acetylene dimer were studied following excitation in the asymmetric CH stretch. Velocity map imaging (VMI) and resonance-enhanced multiphoton ionization (REMPI) were used to determine pair-correlated product energy distributions. Following vibrational excitation of the asymmetric CH stretch fundamental, ammonia fragments were detected by 2 + 1 REMPI via the B 1 E" ← X 1 A 1 ' and C' 1 A 1 ' ←X 1 A 1 ' transitions. The fragments' center- of-mass (c.m.) translational energy distributions were determined from images of selected rotational levels of ammonia with one or two quanta in the symmetric bend (ν 2 umbrella mode) and were converted to rotational-state distributions of the acetylene co-fragment. The latter is always generated with one or two quanta of bending excitation. All the distributions could be fit well when using a dimer dissociation energy of Do = 900 ±10 cm -1 . Only channels with maximum translational energy
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::98c2aa54d72d6b8abf7902b50da63924 https://doi.org/10.1021/jp070838+ Zobrazit plný text záznamu