Lambda doubling in the infrared spectrum of SH

1984 ◽  
Vol 62 (12) ◽  
pp. 1420-1425 ◽  
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).

The infrared spectrum of CS

1984 ◽  
Vol 62 (12) ◽  
pp. 1414-1419 ◽  
Author(s):  
R. J. Winkel Jr. ◽  
Sumner P. Davis ◽  
Rubén Pecyner ◽  
James W. Brault
Keyword(s):  
Fourier Transform ◽  
Infrared Emission ◽  
Solar Observatory ◽  
Band Head ◽  
The Other ◽  
Fourier Transform Spectrometer ◽  
National Solar Observatory ◽  
Carbon Monosulfide ◽  
Vibration Rotation ◽  
The Fourier Transform

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.

scholarly journals Solar 5-minute Oscillations at 2.23 μm

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.

The infrared spectrum of H2S from 1 to 5 μm

1994 ◽  
Vol 72 (11-12) ◽  
pp. 989-1000 ◽  
Author(s):  
Alexander D. Bykov ◽  
Olga V. Naumenko ◽  
Maxim A. Smirnov ◽  
Leonid N. Sinitsa ◽  
Linda R. Brown ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Energy Spectrum ◽  
Infrared Spectrum ◽  
Energy Levels ◽  
Local Mode ◽  
Fourier Transform Spectrometer ◽  
National Observatory ◽  
The Fourier Transform ◽  
High Degree ◽  
First Time

The absorption spectra of H2S from 2000 to 11 147 cm−1 have been obtained with spectral resolutions of 0.006, 0.012, and 0.021 cm−1 using the Fourier transform spectrometer at Kitt Peak National Observatory. The transitions of 21 bands have been assigned for the first time and 9 others reanalyzed so that accurate energy levels, band origins, and rotational parameters could be determined. The analysis of these data revealed some remarkable features in the energy spectrum, e.g., fourfold clustering of rotational levels belonging to the symmetric and asymmetric components of local mode manifolds at a high degree of stretching excitation. This paper reports fitted vibrational parameters and predicted band origins of H232S up to 12 735 cm−1. It also presents the degenerate rotational constants and upper state energies of (301)–(202) and (311)–(212) at 1 μm as illustrations of clustering in the local mode limit.

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

1984 ◽  
Vol 62 (3) ◽  
pp. 254-259 ◽  
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.

FTIR Study of the v12 and the v12 + v14 — v14 Bands of 1,3,5-Triazine Near 740 cm-1

1992 ◽  
Vol 47 (12) ◽  
pp. 1197-1203
Author(s):  
Wolfram Bodenmüller ◽  
Andreas Ruoff ◽  
Laurent Manceron
Keyword(s):  
Fourier Transform ◽  
Excited State ◽  
Infrared Spectrum ◽  
Excited States ◽  
Ground State ◽  
Fourier Transform Spectrometer ◽  
Ftir Study ◽  
Hot Band ◽  
Standard Deviations ◽  
First Time

Abstract The infrared spectrum of the v12 fundamental and its accompanying hot band v12 + v14 - v14 of triazine has been measured by means of a Fourier transform spectrometer with a resolution of about 0.0023 cm-1 . A total of about 2779 rovibrational transitions has been assigned. The ground state constants have been considerably improved whilst the parameters for the excited states v12 = 1, v14 = 1 and v12 = v14 = 1 have been obtained for the first time. The standard deviations were 2.92 • 10-4 cm-1 for the ground state constants and 1.53 • 10-4 cm -1 for the excited state parameters of v12 showing the latter to be unperturbed. The upper state of the hot band v12 + v14 - v14 was found to be perturbed by an accidental resonance.

The infrared spectrum of HNO

1983 ◽  
Vol 61 (7) ◽  
pp. 1106-1119 ◽  
Author(s):  
J. W. C. Johns ◽  
A. R. W. McKellar ◽  
E. Weinberger
Keyword(s):  
Fourier Transform ◽  
Infrared Spectrum ◽  
Flow System ◽  
Fourier Transform Spectrometer ◽  
Hydrogen Deuterium ◽  
Vibration Rotation

Vibration–rotation spectra of HNO (DNO) have been observed in a flow system following the reaction of hydrogen (deuterium) atoms with NO. The spectra were recorded at approximately Doppler limited resolution with a large Fourier transform spectrometer. Complete analyses have been made of the ν1 bands of HNO and DNO with the following results (in cm−1).[Formula: see text]Spectra of ν2 (NO stretching) were also observed in both HNO and DNO, but ν3 (bending) proved too weak to be detected in either molecule.

The antisymmetric stretching fundamental band of free MgD2

2004 ◽  
Vol 82 (6) ◽  
pp. 947-950 ◽  
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 cm–1. The v3 band was rotationally analyzed, and the r0 Mg—D bond distance was determined to be 1.700 874(8) Å.Key words: gaseous MgD2, vibration-rotation emission spectrum, Mg-D bond distance.

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.

scholarly journals Apparent Variation of v sin i and Rotational Modulation in Be Stars

2004 ◽  
Vol 215 ◽  
pp. 93-94
Author(s):  
C. Neiner ◽  
S. Jankov ◽  
M. Floquet ◽  
A. M. Hubert
Keyword(s):  
Fourier Transform ◽  
Magnetic Dipole ◽  
Be Stars ◽  
Line Profiles ◽  
Transform Method ◽  
Rotational Modulation ◽  
Be Star ◽  
Apparent Variation ◽  
The Fourier Transform ◽  
First Time

v sin i was determined by applying the Fourier transform method to the line profiles of two classical Be Stars. A variation is observed in the apparent v sin i which corresponds to the main frequencies associated to nrp modes. Rotational modulation is observed in wind sensitive UV lines of the Be star ω Ori and is associated with an oblique magnetic dipole which is discovered for the first time in a classical Be star.

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

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

<p>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 O<sub>3</sub>, H<sub>2</sub>O, HNO<sub>3</sub>, C<sub>2</sub>H<sub>6</sub>, C<sub>2</sub>H<sub>2</sub>, HCOOH, CCl<sub>4</sub>, PAN, ClONO<sub>2</sub>, CFC-11, CFC-12, SF<sub>6</sub>, OCS, NH<sub>3</sub>, HCN, BrONO<sub>2</sub>, HO<sub>2</sub>NO<sub>2</sub>, N<sub>2</sub>O<sub>5</sub> and NO<sub>2</sub>. 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.</p><p>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<sup>-1</sup> can be achieved.</p><p>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 BrONO<sub>2 </sub>in combination with BrO observations by the DOAS instrument of University Heidelberg on the same platform.</p>

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