Ammonia at 106 V/cm in an 8K argon matrix: Polarization, orientation, and pendularization
Field, Robert W.
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https://hdl.handle.net/2142/100749
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
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.
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