Universität zu Köln

Endres, Christian P., Caselli, Paola and Schlemmer, Stephan ORCID: 0000-0002-1421-7281 (2019). State-to-State Rate Coefficients for NH3-NH3 Collisions from Pump-Probe Chirped Pulse Experiments. J. Phys. Chem. Lett., 10 (17). S. 4836 - 4847. WASHINGTON: AMER CHEMICAL SOC. ISSN 1948-7185

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Abstract

The kinetics of rotational inelastic NH3-NH3 collisions are recorded using pump-probe experiments, carried out with a K-band waveguide chirped pulse Fourier transform microwave spectrometer, in which the population of one inversion doublet is altered by the pump pulse. Due to self-collisions, the resulting deviation from equilibrium propagates to other states and, thus, can be interrogated by probe pulses as a function of the pump-probe delay time. A clear hierarchy of the state-to-state collision processes is found and subsequently translated into propensity rules. State-to-state rate coefficients are estimated, first via an analysis of the kinetics, and then more robustly and accurately derived from the pressure-dependent measurements using a global fitting procedure.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Endres, Christian P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Caselli, Paola UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, Stephan UNSPECIFIED orcid.org/0000-0002-1421-7281 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-141706
DOI:	10.1021/acs.jpclett.9b01653
Journal or Publication Title:	J. Phys. Chem. Lett.
Volume:	10
Number:	17
Page Range:	S. 4836 - 4847
Date:	2019
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1948-7185
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INDUCED TRANSITIONS; ROTATIONAL LEVELS; CROSS-SECTIONS; INVERSION TRANSITIONS; INELASTIC-SCATTERING; NH3; MICROWAVE; DOUBLETS; AMMONIA; T2 Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14170