The infrared spectrum of CS

The infrared emission spectrum of carbon monosulfide was observed as a sequence of vibration–rotation bands in the X1Σ+ state, with strong heads of the Δν = 2 sequence degraded to the red. Eight bands of 12C32S were identified, and bands corresponding to the isotope 12C34S were also observed. The most prominent band head, that of the (2–0) band, is at 2585 cm−1, with the other heads spaced approximately 26 cm−1 to smaller wavenumbers. Our data, taken with the Fourier transform spectrometer at the National Solar Observatory (Kitt Peak) include the first reported laboratory observations of the band heads and as many as 200 lines in each band. These observations allowed the calculation of vibrational and rotational constants to higher order than previously reported.

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Lambda doubling in the infrared spectrum of SH

Canadian Journal of Physics ◽

10.1139/p84-189 ◽

1984 ◽

Vol 62 (12) ◽

pp. 1420-1425 ◽

Cited By ~ 13

Author(s):

R. J. Winkel Jr. ◽

Sumner P. Davis

Keyword(s):

Fourier Transform ◽

Infrared Spectrum ◽

Ground State ◽

Solar Observatory ◽

Fourier Transform Spectrometer ◽

Multiplet Splitting ◽

National Solar Observatory ◽

Vibration Rotation ◽

The Fourier Transform ◽

First Time

The (1–0), (2–1), and (3–2) infrared vibration–rotation bands of the X2Π ground state of sulfur monohydride were observed in emission from a furnace. Multiplet splitting produces two subbands, each of which exhibits lambda splitting. The band heads were observed for the first time, 285 lines were measured, and a calculation of lambda-doubling parameters was made. The spectrum was recorded using the Fourier transform spectrometer at the National Solar Observatory (Kitt Peak).

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Solar 5-minute Oscillations at 2.23 μm

Symposium - International Astronomical Union ◽

10.1017/s0074180900124520 ◽

1994 ◽

Vol 154 ◽

pp. 271-276

Author(s):

Torben Leifsen

Keyword(s):

Time Series ◽

Fourier Transform ◽

Near Infrared ◽

Broad Band ◽

Solar Observatory ◽

Fourier Transform Spectrometer ◽

Large Intensity ◽

National Solar Observatory ◽

Long Run ◽

The Fourier Transform

Large amplitude solar 5-min intensity oscillations have recently been detected at 2.23 μm using broad band (650 Å FWHM) photometry (Leifsen and Maltby, 1990). Large intensity amplitudes in a broad range in the near infrared was unexpected, and several questions concerning the source of the high amplitudes were raised. In an attempt to study the nature of these oscillations, time series of spectra have been obtained with the Fourier Transform Spectrometer (FTS) of the McMath telescope at National Solar Observatory at Kitt Peak. We present preliminary results from a 10 day long run in May 1991 in support for the suggestion that the results may be useful in both helio- and asteroseismological investigations.

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The antisymmetric stretching fundamental band of free MgD2

Canadian Journal of Chemistry ◽

10.1139/v04-043 ◽

2004 ◽

Vol 82 (6) ◽

pp. 947-950 ◽

Cited By ~ 7

Author(s):

Alireza Shayesteh ◽

Dominique RT Appadoo ◽

Iouli Gordon ◽

Peter F Bernath

Keyword(s):

Fourier Transform ◽

Emission Spectrum ◽

Electrical Discharge ◽

Bond Distance ◽

Infrared Emission ◽

Fourier Transform Spectrometer ◽

High Temperature Furnace ◽

Vibration Rotation ◽

First Time ◽

Temperature Furnace

The gaseous MgD2 molecule has been synthesized for the first time in an electrical discharge inside a high-temperature furnace. The high-resolution infrared emission spectrum of MgD2 was recorded with a Fourier transform spectrometer, and the antisymmetric stretching mode (v3) was detected near 1176.5 cm1. The v3 band was rotationally analyzed, and the r0 MgD bond distance was determined to be 1.700 874(8) Å.Key words: gaseous MgD2, vibration-rotation emission spectrum, Mg-D bond distance.

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Le niveau de base du silane obtenu à partir de l'étude du spectre à transformée de Fourier de ν2 et ν4

Canadian Journal of Physics ◽

10.1139/p84-040 ◽

1984 ◽

Vol 62 (3) ◽

pp. 254-259 ◽

Cited By ~ 29

Author(s):

G. Pierre ◽

A. Valentin ◽

L. Henry

Keyword(s):

Fourier Transform ◽

Standard Deviation ◽

Ground State ◽

Excited Level ◽

Experimental Spectrum ◽

Fourier Transform Spectrometer ◽

Apparatus Function ◽

Vibration Rotation ◽

The Fourier Transform ◽

Rotation Spectrum

We have recorded a vibration–rotation spectrum of 28SiH4 from 840 to 1040 cm−1 with a Fourier transform spectrometer operating with an apparatus-function width of 2 × 10−3 cm−1. An analysis of microwave transitions and 919 combination differences between two different ground state levels and an excited level belonging to the band ν2 or ν4 have been used to determine the value of the ground state constants as expressed in a sixth-order Hamiltonian development. The experimental spectrum needed was recorded with the Fourier transform spectrometer of the Laboratoire de Spectronomie Moléculaire de Paris. The experimental precision is about 0.0001 cm−1. The calculation reproduces these 919 differences with a standard deviation of 0.00019 cm−1.

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Balloon-borne GLORIA hyperspectral Limb and Nadir imager in the LWIR

10.5194/egusphere-egu21-11674 ◽

2021 ◽

Author(s):

Erik Kretschmer ◽

Felix Friedl-Vallon ◽

Thomas Gulde ◽

Michael Höpfner ◽

Sören Johansson ◽

...

Keyword(s):

Fourier Transform ◽

Optical System ◽

Late Summer ◽

High Spectral Resolution ◽

Fourier Transform Spectrometer ◽

System Improvement ◽

The Fourier Transform ◽

Temperature Retrieval ◽

Long Wave Infrared ◽

Better Than

The GLORIA-B (Gimballed Limb Observer for Radiance Imaging of the Atmosphere - Balloon) instrument is an adaptation of the very successful GLORIA-AB imaging Fourier transform spectrometer (iFTS) flown on the research aircrafts HALO and M55 Geophysica. The high spectral resolution in the LWIR (Long Wave Infrared) allows for the retrieval of temperature and of a broad range of atmospheric trace gases, with the goal to retrieve O3, H2O, HNO3, C2H6, C2H2, HCOOH, CCl4, PAN, ClONO2, CFC-11, CFC-12, SF6, OCS, NH3, HCN, BrONO2, HO2NO2, N2O5 and NO2. The radiometric sensitivity of the Balloon instrument is further increased in comparison with the GLORIA-AB instrument by having two detector channels on the same focal plane array, while keeping the same concept of a cooled optical system. This system improvement was achieved with minimal adaptation of the existing optical system.The high spatial and temporal resolution of the instrument is ensured by the imaging capability of the Fourier transform spectrometer while stabilizing the line-of-sight in elevation with the instrument and in azimuth with the balloon gondola. In a single measurement lasting 13 seconds, the atmosphere can be sounded from mid-troposphere up to flight altitude, typically 30 km, with a vertical resolution always better than 1 km for most retrieved species; a spatial resolution up to 0.3 km can be achieved in favourable conditions. Temperature retrieval precision between 0.1 and 0.2 K is expected. A spectral sampling up to 0.0625 cm-1 can be achieved.The first flight of GLORIA-B shall take place during the late-summer polar jet turn-around at Kiruna/ESRANGE. This flight is organised in the frame of the HEMERA project and was scheduled for summer 2020, but was ultimately postponed to summer 2021. Beyond qualification of the first balloon-borne iFTS, the scientific goals of the flight are, among others, the quantification of the stratospheric bromine budget and its diurnal evolution by measuring vertical profiles of BrONO2 in combination with BrO observations by the DOAS instrument of University Heidelberg on the same platform.

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Global distribution of upper tropospheric formic acid from the ACE-FTS

Atmospheric Chemistry and Physics ◽

10.5194/acp-9-8039-2009 ◽

2009 ◽

Vol 9 (20) ◽

pp. 8039-8047 ◽

Cited By ~ 37

Author(s):

G. González Abad ◽

P. F. Bernath ◽

C. D. Boone ◽

S. D. McLeod ◽

G. L. Manney ◽

...

Keyword(s):

Fourier Transform ◽

Formic Acid ◽

Atmospheric Chemistry ◽

South American ◽

Fourier Transform Spectrometer ◽

Vegetation Growth ◽

Solar Occultation ◽

The Fourier Transform ◽

Chemistry Experiment ◽

Seasonal Dependence

Abstract. We present the first near global upper tropospheric distribution of formic acid (HCOOH) observed from space using solar occultation measurements from the Fourier transform spectrometer (FTS) on board the Atmospheric Chemistry Experiment (ACE) satellite. Using a new set of spectroscopic line parameters recently published for formic acid by Vander Auwera et al. (2007) and Perrin and Vander Auwera (2007), we have retrieved the concentrations of HCOOH between 5 km and the tropopause for ACE-FTS observations from February 2004 to September 2007. We observe a significant seasonal dependence for the HCOOH concentrations related to vegetation growth and biomass burning. We estimate an emission ratio of 0.0051±0.0015 for HCOOH relative to CO for tropical South American fires using a selected set of data for September 2004. Results from the balloon-borne MkIV Fourier transform spectrometer are also presented and compared with the ACE measurements.

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Molekülinterne Dipolorientierung und dielektrische Absorption in verdünnter Lösung bei Mikro-und Submillimeterwellen. V.Acetyl-Verbindungen

Zeitschrift für Naturforschung A ◽

10.1515/zna-1989-0914 ◽

1989 ◽

Vol 44 (9) ◽

pp. 853-865

Author(s):

Gerhard Klages

Keyword(s):

Fourier Transform ◽

Dielectric Loss ◽

Steric Hindrance ◽

Loss Factor ◽

The Other ◽

Fourier Transform Spectrometer ◽

Aromatic Rings ◽

Molecular Laser ◽

Aliphatic Compounds ◽

Fast Relaxation

Abstract The dielectric loss of sixteen molecules, eleven with the acetyle group in aromatic bonds and five in aliphatic bonds, has been measured in very dilute solutions of cyclohexene at 20 °C. Five of these molecules are investigated in decalene solutions, too. The measurements have been made at wavenumbers in the range 0.08 to 140 cm -1 above 8 cm -1 making use of a pumped molecular laser. They are supplemented by the data of a Fourier transform spectrometer up to 300 cm -1. All microwave spectra of loss factor ε″ are analysed in terms of three absorption areas using the two variable Mori formalism. On the other hand, Lorentz curves are fitted to the FIR absorption spectra of α(v̄).The fast relaxation process of the aliphatic compounds is suggested to be due to intramolecular reorientation of the acetyle group itself, since in acetyle cyclohexene the remaining part of the molecule is rigid. To the contrary, the acetyle group is not able to reorientate swiftly, if bounded to aromatic rings. Presumably, it is fixed by mesomeric interaction with the dipole in the plain of the ring. However, 2-methyl acetophenone and 1-acetyle naphthone show some quick dipole reorientation, which coincides with a steric hindrance of the group in entering the plain of the ring.

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