Observation of the rotational spectra of van der Waals complexes by free jet absorption millimeter wave spectroscopy: pyridine-argon

1996 ◽  
Vol 261 (3) ◽  
pp. 267-271 ◽  
Author(s):  
Sonia Melandri ◽  
Gianni Maccaferri ◽  
Assimo Maris ◽  
Aldo Millemaggi ◽  
Walther Caminati ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Van Der Waals ◽  
Van Der Waals Complexes ◽  
Rotational Spectra ◽  
Free Jet ◽  
Millimeter Wave Spectroscopy

scholarly journals Rotational spectra of van der Waals complexes: pyrrole–Ne and pyrrole–Ne2

2020 ◽  
Vol 22 (44) ◽  
pp. 25652-25660 ◽  
Author(s):  
Isabel Peña ◽  
Carlos Cabezas
Keyword(s):  
Fourier Transform ◽  
Van Der Waals ◽  
Microwave Spectroscopy ◽  
Frequency Region ◽  
Van Der Waals Complexes ◽  
Chirped Pulse ◽  
Rotational Spectra ◽  
Fourier Transform Microwave Spectroscopy

Rotational spectra of van der Waals complexes pyrrole–Ne and pyrrole–Ne2 have been investigated by chirped pulse Fourier transform microwave spectroscopy in the 2–8 GHz frequency region.

scholarly journals Millimeter wave spectroscopy of cyanoketene (NC–CH=C=O) and an observational search in the ISM

2020 ◽  
Vol 638 ◽  
pp. A3 ◽  
Author(s):  
L. Margulès ◽  
B. A. McGuire ◽  
R. A. Motiyenko ◽  
C. Brogan ◽  
T. Hunter ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Millimeter Wave ◽  
Column Density ◽  
60 Ghz ◽  
Rotational Spectra ◽  
Quantum Numbers ◽  
Millimeter Wave Spectroscopy ◽  
Upper Limits ◽  
Asymmetric Top ◽  
Unambiguous Detection

Context. Ketene was detected in the interstellar medium (ISM) in 1977. Until now, only one derivative, the ketenyl radical, has been observed in this medium. Due to its large dipole moment value, cynaoketene is one of the best candidates for possible ketene derivative detection. Aims. To date, the measurements of the rotational spectra have been limited to 60 GHz. The extrapolation of the prediction in the millimeter wave domain is inaccurate and does not permit an unambiguous detection. Methods. The rotational spectra were re-investigated up to 330 GHz. Using the new prediction cyanoketene was sought after in a variety of astronomical sources: NGS 63341, SgrB2(N), and ASAI sources. Results. A total of 1594 transitions were newly assigned and fitted together with those from previous studies, reaching quantum numbers up to J = 82 and Ka = 24. Watson’s asymmetric top Hamiltonian in the Ir representation was used for the analysis; both reductions A and S were tested. Logically, the S reduction gave the best results confirming that the molecule is very close to the prolate limit. Cynaoketene was not found in ISM; upper limits to the column density were derived in each source.

Free jet absorption millimeter wave spectrum and van der Waals potential energy surface of the 2,3-dihydrofuran-argon adduct

1997 ◽  
Vol 107 (15) ◽  
pp. 5714-5719 ◽  
Author(s):  
Assimo Maris ◽  
Sonia Melandri ◽  
Walther Caminati ◽  
Paolo G. Favero ◽  
Jan Makarewicz
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Millimeter Wave ◽  
Energy Surface ◽  
Van Der Waals ◽  
Wave Spectrum ◽  
Free Jet

Benzonitrile and its van der Waals complexes studied in a free jet. I. The LIF spectra and the structure

1987 ◽  
Vol 86 (3) ◽  
pp. 1111-1117 ◽  
Author(s):  
Tohru Kobayashi ◽  
Kenji Honma ◽  
Okitsugu Kajimoto ◽  
Soji Tsuchiya
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Complexes ◽  
Free Jet

Two-color photoionization of van der waals complexes of fluorobenzene in a supersonic free jet

1984 ◽  
Vol 107 (1) ◽  
pp. 22-26 ◽  
Author(s):  
Narishi Gonohe ◽  
Atsuo Shimizu ◽  
Haruo Abe ◽  
Naohiko Mikami ◽  
Mitsuo Ito
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Complexes ◽  
Free Jet

scholarly journals Proton Tunneling In 5-Chlorotropolone-M1 (M = Kr, Xe, CH4) Van Der Waals Complexes

1995 ◽  
Vol 15 (2-4) ◽  
pp. 229-247
Author(s):  
Hiroshi Sekiya ◽  
Taiji Nakajima ◽  
Hidenori Hamabe ◽  
Akira Mori ◽  
Hitoshi Takeshita ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Complexes ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Proton Tunneling ◽  
Tunneling Splitting ◽  
Free Jet ◽  
Tunneling Splittings ◽  
Fluorescence Excitation Spectra ◽  
Intramolecular Motions

The S1-S0 fluorescence excitation spectra of 5-chlorotropolone-M1 (M = Kr, Xe, CH4) van der Waals (vdW) complexes in the region near the electronic origin have been measured in a supersonic free jet to investigate the effect of the vdW interactions on proton tunneling. Tunneling splittings have been observed in the vdW vibrations as well as in the 000 transitions of the Kr and Xe complexes. The 000 tunneling splitting of the 5-chlorotropolone-(CH4)1 complex is significantly smaller than those of the Kr and Xe complexes. It has been suggested that the vdW vibrations couple with intramolecular motions, leading to a higher potential energy barrier to tunneling in the CH4 complex. The results of the 5- chlorotropolone complexes have been compared to those of the tropolone complexes.

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