Pure Rotational Spectra of HNCS in the Far Infrared Region: The Three Bending Excited States

1997 ◽  
Vol 183 (1) ◽  
pp. 176-199 ◽  
Author(s):  
M. Niedenhoff ◽  
K.M.T. Yamada ◽  
G. Winnewisser
Keyword(s):  
Excited States ◽  
Far Infrared ◽  
Infrared Region ◽  
Rotational Spectra

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 Broadband spectroscopy of astrophysical ice analogues

2019 ◽  
Vol 629 ◽  
pp. A112 ◽  
Author(s):  
B. M. Giuliano ◽  
A. A. Gavdush ◽  
B. Müller ◽  
K. I. Zaytsev ◽  
T. Grassi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Time Domain ◽  
Complex Refractive Index ◽  
Far Infrared ◽  
Infrared Region ◽  
Thz Radiation ◽  
The Real ◽  
Thz Range ◽  
The Time Domain

Context. Reliable, directly measured optical properties of astrophysical ice analogues in the infrared and terahertz (THz) range are missing from the literature. These parameters are of great importance to model the dust continuum radiative transfer in dense and cold regions, where thick ice mantles are present, and are necessary for the interpretation of future observations planned in the far-infrared region. Aims. Coherent THz radiation allows for direct measurement of the complex dielectric function (refractive index) of astrophysically relevant ice species in the THz range. Methods. We recorded the time-domain waveforms and the frequency-domain spectra of reference samples of CO ice, deposited at a temperature of 28.5 K and annealed to 33 K at different thicknesses. We developed a new algorithm to reconstruct the real and imaginary parts of the refractive index from the time-domain THz data. Results. The complex refractive index in the wavelength range 1 mm–150 μm (0.3–2.0 THz) was determined for the studied ice samples, and this index was compared with available data found in the literature. Conclusions. The developed algorithm of reconstructing the real and imaginary parts of the refractive index from the time-domain THz data enables us, for the first time, to determine the optical properties of astrophysical ice analogues without using the Kramers–Kronig relations. The obtained data provide a benchmark to interpret the observational data from current ground-based facilities as well as future space telescope missions, and we used these data to estimate the opacities of the dust grains in presence of CO ice mantles.

Hagen-Rubens relation beyond far-infrared region

2010 ◽  
Vol 90 (4) ◽  
pp. 44004 ◽  
Author(s):  
F. E. M. Silveira ◽  
S. M. Kurcbart
Keyword(s):  
Far Infrared ◽  
Infrared Region

scholarly journals Graphene-Based Plasmonic Tunable Dual-Band Bandstop Filter in the Far-Infrared Region

2018 ◽  
Vol 10 (6) ◽  
pp. 1-9 ◽  
Author(s):  
Yijun Cai ◽  
Kai Da Xu ◽  
Rongrong Guo ◽  
Jinfeng Zhu ◽  
Qing Huo Liu
Keyword(s):  
Far Infrared ◽  
Infrared Region ◽  
Dual Band ◽  
Bandstop Filter

Reflection Spectra of Calcite in Far-Infrared Region

1971 ◽  
Vol 31 (6) ◽  
pp. 1837-1837 ◽  
Author(s):  
Mitsukazu Onomichi ◽  
Keiei Kudo ◽  
Toshihiro Arai
Keyword(s):  
Far Infrared ◽  
Infrared Region ◽  
Reflection Spectra

scholarly journals Expand bandwidth high reflectivity of the far infrared region

2005 ◽  
Vol 2 (1) ◽  
pp. 65-69
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thin Films ◽  
Far Infrared ◽  
Infrared Region ◽  
High Reflectivity ◽  
Quarter Wavelength ◽  
Multilayer Materials

Was expanded display high reflectivity of the spectral remote infrared (m j 14-8) adoption order Alcolmtin ????????? thickness optical northeastern quarter wavelength and compared with results of previous studies based Aldrashalhalah on Ndharah matrix distinctive amended and fall of light close to the vertical arrangement multilayer materials buffer and in thin films homogeneous and uniform properties deposited on germanium basis results showed that the best choice for governments and their kills to expand bandwidth high reflectivity is much easier for the infrared than the area visible in addition to the order of these stacks is the cornerstone of the filters other visual...

scholarly journals Microwave Spectra of Dimethylether (CH3)2O and (CD3)2O in Excited Torsional States

1978 ◽  
Vol 33 (12) ◽  
pp. 1498-1510 ◽  
Author(s):  
H. Lutz ◽  
H. Dreizler
Keyword(s):  
Fine Structure ◽  
Excited States ◽  
Rotational Spectra ◽  
Microwave Spectra

Abstract The rotational spectra of the torsional excited states v̅n = 11,12,21, 22, 23 have been measured and assigned. The torsional fine structure was used to determine the coefficients V3 and V' 12 of the hindering potential. For (CH3)2O : V3 = 2618 ± 4 cal/mole, V'12 = 18 ± 8 cal/mole, for (CD3)2O : V3 = 2572 ± 6 cal/mole, V'12 = 29 ± 12 cal/mole, V12 was correlated to V3 .

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