scholarly journals The Berkeley Program on Molecules of Astrophysical Interest

1994 ◽  
Vol 146 ◽  
pp. 397-411
Author(s):  
Sumner P. Davis
Keyword(s):  
Fourier Transform ◽  
Spectral Lines ◽  
Carbon Clusters ◽  
Molecular Spectra ◽  
Fourier Transform Spectrometer ◽  
Excitation Energies ◽  
Astrophysical Interest ◽  
Computer Codes ◽  
The Fourier Transform ◽  
Systematic Program

A systematic program of laboratory analyses of selected molecular spectra of astrophysical interest started in 1958 and continues to the present time. The program includes production of spectral atlases, tabulations of spectral lines, analyses, calculations of excitation energies and molecular parameters, measurements of radiative lifetimes, and determinations of transition strengths. Work has been completed or is in progress on the spectra of ArH+, C2, carbon clusters, CN, CS, CaCl, CaH, CaS, FeD, FeH, HgH, HgD, InI, LaO, LaS, OD, OH, SH, Si2, SiC2, TiCl, TiO, TiO+, VO, YS, ZrCl, ZrO, and ZrS. The basic needs for astronomically useful data have not changed, but laboratory and analysis methods have become more sophisticated in order to cope with ever greater demands for consistency, accuracy, and breadth of information. The Fourier transform spectrometer and computer codes for analyses have enhanced our ability to satisfy some of these demands.

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.

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>

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).

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

2009 ◽  
Vol 9 (20) ◽  
pp. 8039-8047 ◽  
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.

The Fourier transform spectrometer of the Université Pierre et Marie Curie QualAir platform

2010 ◽  
Vol 81 (10) ◽  
pp. 103102 ◽  
Author(s):  
Y. Té ◽  
P. Jeseck ◽  
S. Payan ◽  
I. Pépin ◽  
C. Camy-Peyret
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Spectrometer ◽  
Marie Curie ◽  
The Fourier Transform

Nonlinear effects of the Fourier transform spectrometer detector and its correction

2017 ◽  
Vol 46 (10) ◽  
pp. 1023001
Author(s):  
杨敏珠 Yang Minzhu ◽  
邹曜璞 Zou Yaopu ◽  
张 磊 Zhang Lei ◽  
韩昌佩 Han Changpei
Keyword(s):  
Fourier Transform ◽  
Nonlinear Effects ◽  
Fourier Transform Spectrometer ◽  
The Fourier Transform

Introduction to Fourier Transform Spectroscopy

1968 ◽  
Vol 22 (6) ◽  
pp. 617-626 ◽  
Author(s):  
Gary Horlick
Keyword(s):  
Fourier Transform ◽  
Far Infrared ◽  
Fourier Transform Spectroscopy ◽  
Fourier Transform Spectrometer ◽  
Data Handling ◽  
Spectral Measurements ◽  
Recent Developments ◽  
Basic Concepts ◽  
The Fourier Transform ◽  
Spectrometer System

This paper provides an introduction to Fourier transform spectroscopy. The basic concepts of the Fourier transform technique are reviewed. These include the characteristics and generation of interferograms and the generation of spectra by the Fourier transformation of interferograms. The multiplex and throughput advantages and the data handling disadvantages are also discussed. The optical, electronic, and data-handling instrumentation and techniques necessary for a Fourier transform spectrometer system are, in general, quite different from those of a conventional prism or grating spectrometer. The requirements of these areas are outlined and recent developments are reviewed. The Fourier transform technique has been successfully applied to a number of spectral measurements from the visible through to the far infrared. Some of the more recent applications are discussed.

Force Limited Vibration Testing Applied to the Fourier Transform Spectrometer Instrument of SCISAT-1

2004 ◽  
Vol 50 (3) ◽  
pp. 189-197 ◽  
Author(s):  
Yvan Soucy ◽  
Raj Singhal ◽  
Daniel Lévesque ◽  
Richard Poirier ◽  
Terry Scharton
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Spectrometer ◽  
Vibration Testing ◽  
The Fourier Transform

Spectral Line Narrowing by Use of the Theoretical Impulse Response

1997 ◽  
Vol 51 (2) ◽  
pp. 188-200 ◽  
Author(s):  
Pekka E. Saarinen
Keyword(s):  
Fourier Transform ◽  
Linear Prediction ◽  
Spectral Lines ◽  
High Signal ◽  
Line Shapes ◽  
Line Narrowing ◽  
The Fourier Transform ◽  
Spectral Line Narrowing ◽  
Made In ◽  
Prediction Strategy

Fourier transform spectroscopy is nowadays able to produce spectra with extremely high signal-to-noise ratios, and thus extremely high information content. Unfortunately, this information is partially lost because of a lack of sufficiently effective line-narrowing methods to resolve overlapping spectral lines. A novel, and very promising, approach to the problem is the LOMEP line-narrowing method, based on consecutive linear prediction; the line narrowing is carried out in the signal domain by extrapolating the Fourier transform of the spectrum. However, LOMEP is not yet optimal. For example, it does not make use of the information contained in the output line shapes to correct the errors made in linear prediction. In fact, that procedure would not even be possible by using the prediction strategy adopted by LOMEP. Therefore it is possible to considerably improve the method by including the information contained in the distortions of the output spectral lines. In this paper a new method of line narrowing is presented, based on progressive improvement of the prediction until the output is free from distortions. The method is very easy to use and does not require a profound understanding of the underlying mathematics.

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