Rotational spectra and van der Waals potentials of Ne-Ar

authored by: J. U. Grabow, A. S. Pine, G. T. Fraser, F. J. Lovas, R. D. Suenram, T. Emilsson, E. Arunan, H. S. Gutowsky
Abstract: The high sensitivity and resolution of Fourier-transform microwave spectroscopy using a pulsed jet coaxial to a Fabry-Perot resonator have been exploited to measure pure rotational transitions of several isotopomers of the weakly polar Ne-Ar van der Waals dimer in natural abundance. Transitions of the most abundant isotopomer, ²⁰Ne-⁴⁰Ar, could be observed with an excellent signal-to-noise ratio with a single polarization pulse. The ground-state rotational constants for this species yield a zero-point separation of R₀≃360.7 pm. Simple model van der Waals potentials have been fit to the microwave transitions for the various isotopomers, providing estimates of the equilibrium spacing at the well minimum of R _e=348.0(2) pm. More elaborate potentials based on ab initio calculations or on molecular-beam scattering cross sections and thermodynamic and transport properties have also been tested. The induced electric dipole moment is estimated to be μ₀=7.3(1.6)×10^-33 C m [0.0022(5) D] by comparison of π/2 polarization pulses with a reference molecule (Ar-CO₂) whose dipole moment is known from Stark effect splitting measurements. Uncertainties in parentheses are one standard deviation.
Organisation(s): Institute of Physical Chemistry and Electrochemistry
External Organisation(s): National Institute of Standards and Technology (NIST)
University of Illinois at Urbana-Champaign
Type: Article
Journal: The journal of chemical physics
Volume: 102
Pages: 1181-1187
No. of pages: 7
ISSN: 0021-9606
Publication date: 1995
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Physics and Astronomy, Physical and Theoretical Chemistry
Electronic version(s): https://doi.org/10.1063/1.468904 (Access: Unknown)

BibTeX

@article{6a94b2f0978b43d5a994e00942d84355,
title = "Rotational spectra and van der Waals potentials of Ne-Ar",
abstract = "The high sensitivity and resolution of Fourier-transform microwave spectroscopy using a pulsed jet coaxial to a Fabry-Perot resonator have been exploited to measure pure rotational transitions of several isotopomers of the weakly polar Ne-Ar van der Waals dimer in natural abundance. Transitions of the most abundant isotopomer, 20Ne-40Ar, could be observed with an excellent signal-to-noise ratio with a single polarization pulse. The ground-state rotational constants for this species yield a zero-point separation of R0≃360.7 pm. Simple model van der Waals potentials have been fit to the microwave transitions for the various isotopomers, providing estimates of the equilibrium spacing at the well minimum of R e=348.0(2) pm. More elaborate potentials based on ab initio calculations or on molecular-beam scattering cross sections and thermodynamic and transport properties have also been tested. The induced electric dipole moment is estimated to be μ0=7.3(1.6)×10-33 C m [0.0022(5) D] by comparison of π/2 polarization pulses with a reference molecule (Ar-CO2) whose dipole moment is known from Stark effect splitting measurements. Uncertainties in parentheses are one standard deviation.",
author = "Grabow, {J. U.} and Pine, {A. S.} and Fraser, {G. T.} and Lovas, {F. J.} and Suenram, {R. D.} and T. Emilsson and E. Arunan and Gutowsky, {H. S.}",
year = "1995",
doi = "10.1063/1.468904",
language = "English",
volume = "102",
pages = "1181--1187",
journal = "The journal of chemical physics",
issn = "0021-9606",
publisher = "American Institute of Physics",
number = "3",
}