Details
| Original language | English |
|---|---|
| Pages (from-to) | 1181-1187 |
| Number of pages | 7 |
| Journal | The journal of chemical physics |
| Volume | 102 |
| Issue number | 3 |
| Publication status | Published - 1995 |
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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: The journal of chemical physics, Vol. 102, No. 3, 1995, p. 1181-1187.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Rotational spectra and van der Waals potentials of Ne-Ar
AU - Grabow, J. U.
AU - Pine, A. S.
AU - Fraser, G. T.
AU - Lovas, F. J.
AU - Suenram, R. D.
AU - Emilsson, T.
AU - Arunan, E.
AU - Gutowsky, H. S.
PY - 1995
Y1 - 1995
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0000544635&partnerID=8YFLogxK
U2 - 10.1063/1.468904
DO - 10.1063/1.468904
M3 - Article
AN - SCOPUS:0000544635
VL - 102
SP - 1181
EP - 1187
JO - The journal of chemical physics
JF - The journal of chemical physics
SN - 0021-9606
IS - 3
ER -