Infrared photodissociation spectroscopy of protonated ammonia clusters in the gas phase
Colley, Jason E.
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https://hdl.handle.net/2142/104379
Description
Title
Infrared photodissociation spectroscopy of protonated ammonia clusters in the gas phase
Author(s)
Colley, Jason E.
Contributor(s)
Duncan, Michael A.
Wagner, J. Philipp
Issue Date
2019-06-19
Keyword(s)
Non-covalent interactions
Abstract
The clustering of protonated ammonia clusters, a known interstellar ion, are studied with infrared photodissociation spectroscopy in the region of 4700 to 7200 cm$^{-1}$. H$^{+}$(NH$_{3}$)$_{n}$ clusters up to n=8 are produced using a pulsed electrical discharge in a supersonic expansion. Mass-selected ions are investigated using tunable infrared laser photodissociation in the turning region of a reflectron time of flight mass spectrometer. Clusters of protonated ammonia are probed through the dissociative elimination of an ammonia. The spectra gathered were assigned by comparing to B2PLYP/def2-TZVP computations. Two bands are consistently observed for the studied protonated ammonia clusters. A band at around 5000 cm$^{-1}$ is attributed to a combination of the N-H stretching and bending modes. Another band at around 6500 cm$^{-1}$ is assigned to either an overtone or a combination of the N-H stretching modes.
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