A HIGHLY-INTEGRATED SUPERSONIC-JET FOURIER TRANSFORM MICROWAVE SPECTROMETER

2017 ◽  
Author(s):  
Jens-Uwe Grabow ◽  
Gang Feng ◽  
Qian Gou
Keyword(s):  
Fourier Transform ◽  
Supersonic Jet ◽  
Microwave Spectrometer

Conformational changes in hydroxyl functional group upon hydration: the case study of Endo Fenchol

2020 ◽  
Author(s):  
Elias M Neeman ◽  
Thérèse Huet
Keyword(s):  
Fourier Transform ◽  
Gas Phase ◽  
Conformational Changes ◽  
Functional Group ◽  
Theoretical Calculations ◽  
Supersonic Jet ◽  
Microwave Spectrometer ◽  
Supersonic Jet Expansion ◽  
Hydroxyl Functional Group

The hydration of endo-fenchol has been studied in the gas phase using a combination of Fourier transform microwave spectrometer coupled to a supersonic jet expansion and theoretical calculations in the...

Supersonic-jet cryogenic-resonator coaxially oriented beam-resonator arrangement Fourier transform microwave spectrometer

2005 ◽  
Vol 76 (9) ◽  
pp. 093106 ◽  
Author(s):  
Jens-Uwe Grabow ◽  
E. Samuel Palmer ◽  
Michael C. McCarthy ◽  
Patrick Thaddeus
Keyword(s):  
Fourier Transform ◽  
Supersonic Jet ◽  
Beam Resonator ◽  
Microwave Spectrometer

Ground state molecular parameters of phosphine, PH3, from the simultaneous analysis of the high-resolution infrared, microwave and submillimeterwave spectra

1985 ◽  
Vol 50 (11) ◽  
pp. 2480-2492 ◽  
Author(s):  
Soňa Přádná ◽  
Dušan Papoušek ◽  
Jyrki Kauppinen ◽  
Sergei P. Belov ◽  
Andrei F. Krupnov ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Ground State ◽  
Unitary Transformation ◽  
Point Of View ◽  
Acoustic Detection ◽  
Molecular Parameters ◽  
Microwave Spectrometer ◽  
Fourier Transform Spectra ◽  
First Time

Fourier transform spectra of the ν2 band of PH3 have been remeasured with 0.0045 cm-1 resolution. Ground state combination differences from these data have been fitted simultaneously with the microwave and submillimeterwave data to determine the ground state spectroscopical parameters of PH3 including the parameters of the Δk = ± 3n interactions. The correlation between the latter parameters has been discussed from the point of view of the existence of two equivalent effective rotational operators which are related by a unitary transformation. The ΔJ = 0, +1, ΔK = 0 (A1 ↔ A2, E ↔ E) rotational transitions in the ν2 and ν4 states have been measured for the first time by using a microwave spectrometer and a radiofrequency spectrometer with acoustic detection.

A rotational spectroscopic and ab initio study of cis and trans (-)-carveol: Further insights into conformational dynamics in monoterpenes and monoterpenoids

2021 ◽  
Author(s):  
Arsh Singh Hazrah ◽  
Mohamad al-Jabiri ◽  
Raiden Speelman ◽  
Wolfgang Jaeger
Keyword(s):  
Fourier Transform ◽  
Ab Initio ◽  
Conformational Dynamics ◽  
Ab Initio Study ◽  
Chirped Pulse ◽  
Rotational Spectra ◽  
Microwave Spectrometer ◽  
Cis And Trans

Broadband rotational spectra of cis- and trans- (-) carveol were recorded using a chirped pulse Fourier transform microwave spectrometer in the 2-6 GHz region. To aid in spectroscopic assignments a...

scholarly journals Rotational spectroscopy and astronomical search for glutaronitrile

2020 ◽  
Vol 636 ◽  
pp. A33
Author(s):  
C. Cabezas ◽  
C. Bermúdez ◽  
Y. Endo ◽  
B. Tercero ◽  
J. Cernicharo
Keyword(s):  
Fourier Transform ◽  
Supersonic Jet ◽  
Rotational Spectrum ◽  
Millimetre Wave ◽  
Quantum Numbers ◽  
Upper Limits ◽  
Quadrupole Coupling ◽  
Centrifugal Distortion Constants ◽  
High Level ◽  
Total Column

Context. Nitriles constitute almost 15% of the molecules observed in the interstellar medium (ISM), surprisingly only two dinitriles have been detected in the ISM so far. The lack of astronomical detections for dinitriles may be partly explained by the absence of laboratory rotational spectroscopic data. Aims. Our goal is to investigate the rotational spectrum of glutaronitrile, N≡C−CH2−CH2−CH2−C≡N, in order to allow its possible detection in the ISM. Methods. The rotational spectrum of glutaronitrile was measured using two different experimental setups. A Fourier transform microwave spectrometer was employed to observe the supersonic jet rotational spectrum of glutaronitrile between 6 and 20 GHz. In addition, the mmW spectrum was observed in the frequency range 72−116.5 GHz using a broadband millimetre-wave spectrometer based on radio astronomy receivers with fast Fourier transform backends. The spectral searches were supported by high-level ab initio calculations. Results. A total of 111 rotational transitions with maximum values of J and Ka quantum numbers 54 and 18, respectively, were measured for the gg conformer of glutaronitrile. The analysis allowed us to accurately determine the rotational, nuclear quadrupole coupling, quartic and sextic centrifugal distortion constants. These rotational parameters were employed to search for glutaronitrile in the cold and warm molecular clouds Orion KL, Sgr B2(N), B1-b and TMC-1, using the spectral surveys captured by IRAM 30 m at 3 mm. Glutaronitrile was not detected, and the upper limits’ column densities were derived. Those are a factor of 1.5 and 5 lower than those obtained for the total column densities of the analogous succinonitrile in Orion KL and Sgr B2, respectively.

Observation of Carbonyl Fluoride, Ketene, Acetic Acid and Fluorocarbene Produced by an Electric Discharge within a Nozzle by Molecular Beam Fourier Transform Microwave Spectroscopy. A Reaction via a Cycloaddition for Carbonyl Fluoride and Keten?

2000 ◽  
Vol 55 (8) ◽  
pp. 695-705 ◽  
Author(s):  
D. H. Sutter ◽  
H. Dreizler
Keyword(s):  
Carbon Dioxide ◽  
Acetic Acid ◽  
Fourier Transform ◽  
Molecular Beam ◽  
Reaction Path ◽  
Microwave Spectroscopy ◽  
Electrical Discharges ◽  
Microwave Spectrometer ◽  
Precursor Molecules ◽  
Carbonyl Fluoride

Abstract A molecular beam Fourier transform microwave spectrometer, designed for the study of chemical reactions within electrical discharges, is described in detail. Applications include the production of carbonyl fluoride, ketene, acetic acid, and difluorocarbene. For the production of carbonyl fluoride and ketene with 1,1-difluoroethylene and carbon dioxide as precursor molecules a reaction path via a 2+2 cycloaddition is proposed.

Photodissociation Dynamics of Vinyl Chloride Investigated with a Pulsed Slit-Jet and Time-Resolved Fourier-Transform Spectroscopy

2004 ◽  
Vol 57 (12) ◽  
pp. 1161 ◽  
Author(s):  
Mohammed Bahou ◽  
Yuan-Pern Lee
Keyword(s):  
Fourier Transform ◽  
Vinyl Chloride ◽  
Flow System ◽  
Supersonic Jet ◽  
Infrared Emission ◽  
Time Resolved ◽  
Type Distribution ◽  
Trajectory Calculations ◽  
Rotational Distribution ◽  
193 Nm

Following photodissociation of vinyl chloride seeded in a He supersonic jet at 193 nm, rotationally resolved infrared emission of HCl (v) are recorded to yield nascent rotational and vibrational distributions. Preliminary results show that the rotational distribution of HCl free from rotational quenching deviates slightly from Boltzmann-type distribution and agrees well with trajectory calculations; a portion of the low-J component observed previously in a flow system is attributed to quenching. The implications for photodissociation dynamics are discussed.

A multioctave coaxially oriented beam‐resonator arrangement Fourier‐transform microwave spectrometer

1996 ◽  
Vol 67 (12) ◽  
pp. 4072-4084 ◽  
Author(s):  
Jens‐Uwe Grabow ◽  
Wolfgang Stahl ◽  
Helmut Dreizler
Keyword(s):  
Fourier Transform ◽  
Beam Resonator ◽  
Microwave Spectrometer
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