scholarly journals Chirped-pulse Fourier transform millimeter-wave spectroscopy of ten vibrationally excited states of i-propyl cyanide: exploring the far-infrared region

2017 ◽  
Vol 19 (3) ◽  
pp. 1751-1756 ◽  
Author(s):  
Benjamin E. Arenas ◽  
Sébastien Gruet ◽  
Amanda L. Steber ◽  
Barbara M. Giuliano ◽  
Melanie Schnell
Keyword(s):  
Excited States ◽  
Far Infrared ◽  
Infrared Region ◽  
Interstellar Space ◽  
Frequency Range ◽  
Vibrationally Excited ◽  
Data Set ◽  
Millimetre Wave ◽  
Chirped Pulse ◽  
Millimeter Wave Spectroscopy

The astrochemically relevant molecule i-propyl cyanide is studied in the millimetre wave frequency range. The extensive data set for isotopologues and ten vibrationally excited states will support further astronomical searches and identifications, such as in warmer regions of interstellar space.

Identification of a vibrationally excited level in methyl formate through microwave and far-infrared spectroscopy

2020 ◽  
Vol 98 (6) ◽  
pp. 551-554
Author(s):  
Kaori Kobayashi ◽  
Yusuke Sakai ◽  
Masaharu Fujitake ◽  
Dennis W. Tokaryk ◽  
Brant E. Billinghurst ◽  
...  
Keyword(s):  
Excited States ◽  
Ground State ◽  
Methyl Formate ◽  
Excited Level ◽  
Far Infrared ◽  
Infrared Region ◽  
Far Infrared Spectroscopy ◽  
Interstellar Molecule ◽  
Vibrationally Excited ◽  
Rotational Transitions

Methyl formate (HCOOCH3) is an important interstellar molecule. More than 1000 rotational transitions including those from the ground state, torsionally excited states, and of its isotopologues have been observed towards several astrophysical sources. The laboratory spectra of methyl formate in the microwave spectral region contain many unassigned transitions and many of them are likely to be due to rotational transitions in the low-lying excited states. We report the laboratory identification of new rotational transitions in the COC deformation (ν12) excited state. The identification was made possible by combining the microwave data with rotation–vibration spectra taken in the far-infrared region at the Canadian Light Source synchrotron.

scholarly journals Millimeter-wave spectroscopy of HC5N in vibrationally excited states below 500 cm$\mathsf{^{-1}}$

2004 ◽  
Vol 425 (2) ◽  
pp. 767-772 ◽  
Author(s):  
K. M. T. Yamada ◽  
C. Degli Esposti ◽  
P. Botschwina ◽  
P. Förster ◽  
L. Bizzocchi ◽  
...  
Keyword(s):  
Excited States ◽  
Millimeter Wave ◽  
Vibrationally Excited ◽  
Millimeter Wave Spectroscopy

Millimeter-wave spectroscopy of the FeCO radical in the ν2 and ν3 vibrationally excited states

2015 ◽  
Vol 143 (1) ◽  
pp. 014303 ◽  
Author(s):  
Keiichi Tanaka ◽  
Mitsuhiro Nakamura ◽  
Mitsuaki Shirasaka ◽  
Ai Sakamoto ◽  
Kensuke Harada ◽  
...  
Keyword(s):  
Excited States ◽  
Millimeter Wave ◽  
Vibrationally Excited ◽  
Millimeter Wave Spectroscopy

scholarly journals Millimeter-wave spectroscopy of the chlorine isotopologues of chloropyrazine and twenty-two of their vibrationally excited states

2019 ◽  
Vol 364 ◽  
pp. 111179 ◽  
Author(s):  
Phoenix M. Higgins ◽  
Brian J. Esselman ◽  
Maria A. Zdanovskaia ◽  
R. Claude Woods ◽  
Robert J. McMahon
Keyword(s):  
Excited States ◽  
Millimeter Wave ◽  
Vibrationally Excited ◽  
Millimeter Wave Spectroscopy

scholarly journals О возможностях многомерной эквидистантной абсорбционной спектроскопии в широком диапазоне частот в исследованиях фракций термической разгонки нефти

2020 ◽  
Vol 128 (4) ◽  
pp. 564
Author(s):  
Н.И. Егорова ◽  
И.О. Конюшенко ◽  
В.М. Немец ◽  
С.А. Пеганов
Keyword(s):  
Molecular Spectroscopy ◽  
Far Infrared ◽  
Infrared Region ◽  
Molecular Composition ◽  
Complex Mixtures ◽  
Wide Spectral Range ◽  
Frequency Range ◽  
Single Object ◽  
Thermal Oil ◽  
And Control

The features and possibilities of absorption molecular spectroscopy of complex mixtures of organic compounds by the instance of oil thermal distillation fractions are studied. The problem of studying the spectra of oil fractions as a single object of complex molecular composition was directly solved (i.e. without studing of molecular composition). Thereby multidimensional equidistant spectra were studied in a wide spectral range. Measurement conditions: frequency range from 500 to 1500 cm-1, spectral resolution 1 cm-1, frequency increment 0.5 cm-1, Objects under investigation - 33 fractions of thermal oil distillation. Results processing of spectroscopic measurements was carried out using methods of multifactor mathematical statistics. The efficiency of using absorption molecular spectroscopy in the far infrared region in the study and control of the optical characteristics (absorption spectra) of oil thermal distillation fractions is shown.

Broad band absorption of solutes in liquid solutions and in polystyrene

1977 ◽  
Vol 55 (12) ◽  
pp. 2411-2416
Author(s):  
C. K. McLellan ◽  
S. Walker
Keyword(s):  
Broad Band ◽  
Far Infrared ◽  
Infrared Region ◽  
Frequency Range ◽  
Molecular Relaxation ◽  
Liquid Benzene ◽  
Polystyrene Matrix ◽  
Liquid Solutions ◽  
Polar Solutes ◽  
Band Absorption

Broad band absorptions in the frequency range 20 to 100 cm−1 arising from four polar solutes in polystyrene matrices have been observed at 302 K and compared with those in liquid benzene or cyclohexane solutions. A broad band was also found for 1,4-diacetylbenzene in a polystyrene matrix at 124 K. The broad band absorption still occurs in the far-infrared region when group and/or molecular relaxation(s) occur in appreciably lower frequency regions. The significance of these absorptions is discussed in terms of some models which account for the origins of broad band absorptions.

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