Details
| Original language | English |
|---|---|
| Pages (from-to) | 119-121 |
| Number of pages | 3 |
| Journal | Journal of molecular spectroscopy |
| Volume | 247 |
| Issue number | 1 |
| Publication status | Published - Jan 2008 |
Abstract
An experimental determination of the dipole moment using Fourier transform microwave spectroscopy (FTMW) in homogenous electric fields was conducted. Benzonitrile was co-expanded in 3.5 bar of Ne at a temperature of 300 K through a pulsed nozzle with a 0.8-mm orifice. The supersonic expansion was pulsed coaxially into the microwave resonator, which was specially developed to provide high sensitivity and resolution at low frequencies down to 2 GHz. Some of the lowest rotational transitions of benzonitrile in the range of 2.8-10.9 GHz were recorded with a linewidth (FWHM) of 2.5 kHz and a frequency accuracy of 500 Hz. Homogeneous electric fields for the Stark-shift measurements were provided by the Coaxially Aligned Electrodes for Stark effect Applied in Resonators (CAESAR) setup where electric field strengths up to 203 V/cm could be reached. The value of the dipole moment of benzonitrile was determined precisely to μa = 4.5152(68) D from Stark-shift measurements.
Keywords
- Benzonitrile, Cold molecules, Dipole moment, Microwave spectroscopy, Nuclear quadrupole coupling, Rotational spectroscopy, Stark effect, Supersonic-jet
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Chemistry(all)
- Spectroscopy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of molecular spectroscopy, Vol. 247, No. 1, 01.2008, p. 119-121.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Precise dipole moment and quadrupole coupling constants of benzonitrile
AU - Wohlfart, Kirstin
AU - Schnell, Melanie
AU - Grabow, Jens Uwe
AU - Küpper, Jochen
PY - 2008/1
Y1 - 2008/1
N2 - An experimental determination of the dipole moment using Fourier transform microwave spectroscopy (FTMW) in homogenous electric fields was conducted. Benzonitrile was co-expanded in 3.5 bar of Ne at a temperature of 300 K through a pulsed nozzle with a 0.8-mm orifice. The supersonic expansion was pulsed coaxially into the microwave resonator, which was specially developed to provide high sensitivity and resolution at low frequencies down to 2 GHz. Some of the lowest rotational transitions of benzonitrile in the range of 2.8-10.9 GHz were recorded with a linewidth (FWHM) of 2.5 kHz and a frequency accuracy of 500 Hz. Homogeneous electric fields for the Stark-shift measurements were provided by the Coaxially Aligned Electrodes for Stark effect Applied in Resonators (CAESAR) setup where electric field strengths up to 203 V/cm could be reached. The value of the dipole moment of benzonitrile was determined precisely to μa = 4.5152(68) D from Stark-shift measurements.
AB - An experimental determination of the dipole moment using Fourier transform microwave spectroscopy (FTMW) in homogenous electric fields was conducted. Benzonitrile was co-expanded in 3.5 bar of Ne at a temperature of 300 K through a pulsed nozzle with a 0.8-mm orifice. The supersonic expansion was pulsed coaxially into the microwave resonator, which was specially developed to provide high sensitivity and resolution at low frequencies down to 2 GHz. Some of the lowest rotational transitions of benzonitrile in the range of 2.8-10.9 GHz were recorded with a linewidth (FWHM) of 2.5 kHz and a frequency accuracy of 500 Hz. Homogeneous electric fields for the Stark-shift measurements were provided by the Coaxially Aligned Electrodes for Stark effect Applied in Resonators (CAESAR) setup where electric field strengths up to 203 V/cm could be reached. The value of the dipole moment of benzonitrile was determined precisely to μa = 4.5152(68) D from Stark-shift measurements.
KW - Benzonitrile
KW - Cold molecules
KW - Dipole moment
KW - Microwave spectroscopy
KW - Nuclear quadrupole coupling
KW - Rotational spectroscopy
KW - Stark effect
KW - Supersonic-jet
UR - http://www.scopus.com/inward/record.url?scp=37749010085&partnerID=8YFLogxK
U2 - 10.1016/j.jms.2007.10.006
DO - 10.1016/j.jms.2007.10.006
M3 - Article
AN - SCOPUS:37749010085
VL - 247
SP - 119
EP - 121
JO - Journal of molecular spectroscopy
JF - Journal of molecular spectroscopy
SN - 0022-2852
IS - 1
ER -