Ammonia at 106 V/cm in an 8K argon matrix: Polarization, orientation, and pendularization

Field, Robert W.

Permalink

https://hdl.handle.net/2142/100749 Copy

Description

Title

Ammonia at 106 V/cm in an 8K argon matrix: Polarization, orientation, and pendularization

Author(s)

Field, Robert W.

Contributor(s)

• Kang, Heon
• Park, Youngwook

Issue Date

2018-06-22

Keyword(s)

Fundamental interest

Date of Ingest

• 2018-08-17T16:09:40Z
• 2018-12-12T22:35:21Z

Abstract

The ν2 band of NH3 and ND3 in solid Ar at 8K inside an ice-film nanocapacitor is observed by reflection-absorption infrared spectroscopy (RAIRS). Ammonia is an almost-free rotor in the Ar matrix. As the electric field is increased up to 1x106 V/cm, the spectrum undergoes a sequence of (reversible) changes driven by two kinds of Stark effect: mixing of inversion doublet components (for Kc≥ 1) and c-dipole type ∆K=0, ∆J=±1 J-mixing. Mixing of inversion doublets results in quenching of the inversion dynamics and J-mixing leads toward pendularization. H vs. D nuclear permutation symmetry effects are clearly visible in the spectrum. At 106 V/cm and 8 K, the Stark interaction energy, µE = 25 cm−1 , is larger than kBT = 5.6 cm−1 and intermediate between the inversion splittings in the NH3 v=0 and v2=1 levels, 0.79 and 36.5 cm−1 . This frequency domain spectrum in a scanned DC electric field encodes a more complete dynamical picture than experiments in which an extremely high electric field is generated by a focused ultrafast laser pulse.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Genre of Resource

Conference Paper / Presentation

Language

eng

Permalink

http://hdl.handle.net/2142/100749

DOI

10.15278/isms.2018.FD08

Copyright and License Information

Copyright 2018 Robert W. Field

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