High-resolution Fourier transform measurement of the NO2visible and near-infrared absorption cross sections: Temperature and pressure effects

2002 ◽  
Vol 107 (D18) ◽  
Author(s):  
A. C. Vandaele
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Cross Sections ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Pressure Effects ◽  
Absorption Cross ◽  
Temperature And Pressure ◽  
Temperature And Pressure Effects

Absorption cross-sections of NO2: simulation of temperature and pressure effects

2003 ◽  
Vol 76 (3-4) ◽  
pp. 373-391 ◽  
Author(s):  
A.C. Vandaele ◽  
C. Hermans ◽  
S. Fally ◽  
M. Carleer ◽  
M.-F. Mérienne ◽  
...  
Keyword(s):  
Cross Sections ◽  
Pressure Effects ◽  
Absorption Cross ◽  
Temperature And Pressure ◽  
Temperature And Pressure Effects

scholarly journals New and improved infrared absorption cross sections for chlorodifluoromethane (HCFC-22)

2016 ◽  
Vol 9 (6) ◽  
pp. 2593-2601 ◽  
Author(s):  
Jeremy J. Harrison
Keyword(s):  
High Resolution ◽  
Cross Sections ◽  
Infrared Absorption ◽  
Stratospheric Ozone ◽  
Optical Path Difference ◽  
Path Difference ◽  
Montreal Protocol ◽  
Absorption Cross ◽  
Atmospheric Conditions ◽  
The One

Abstract. The most widely used hydrochlorofluorocarbon (HCFC) commercially since the 1930s has been chloro-difluoromethane, or HCFC-22, which has the undesirable effect of depleting stratospheric ozone. As this molecule is currently being phased out under the Montreal Protocol, monitoring its concentration profiles using infrared sounders crucially requires accurate laboratory spectroscopic data. This work describes new high-resolution infrared absorption cross sections of chlorodifluoromethane over the spectral range 730–1380 cm−1, determined from spectra recorded using a high-resolution Fourier transform spectrometer (Bruker IFS 125HR) and a 26 cm pathlength cell. Spectra of chlorodifluoromethane/dry synthetic air mixtures were recorded at resolutions between 0.01 and 0.03 cm−1 (calculated as 0.9/MOPD; MOPD denotes the maximum optical path difference) over a range of temperatures and pressures (7.5–762 Torr and 191–295 K) appropriate for atmospheric conditions. This new cross-section dataset improves upon the one currently available in the HITRAN (HIgh-resolution TRANsmission) and GEISA (Gestion et Etude des Informations Spectroscopiques Atmosphériques) databases; in particular it provides coverage over a wider range of pressures and temperatures, has more accurate wavenumber scales, more consistent integrated band intensities, improved signal-to-noise, is free of channel fringing, and additionally covers the ν2 and ν7 bands.

scholarly journals New and improved infrared absorption cross sections for trichlorofluoromethane (CFC-11)

2018 ◽  
Author(s):  
Jeremy J. Harrison
Keyword(s):  
High Resolution ◽  
Cross Sections ◽  
Infrared Absorption ◽  
Stratospheric Ozone ◽  
Optical Path Difference ◽  
Path Difference ◽  
Montreal Protocol ◽  
Absorption Cross ◽  
Atmospheric Conditions ◽  
Vertical Concentration Profile

Abstract. Trichlorofluoromethane (CFC-11), a widely used refrigerant throughout much of the twentieth century and a very potent (stratospheric) ozone depleting substance (ODS), is now banned under the Montreal Protocol. With a long atmospheric lifetime, it will only slowly degrade in the atmosphere, so monitoring its vertical concentration profile using infrared-sounding instruments, thereby validating stratospheric loss rates in atmospheric models, is of great importance; this in turn requires high quality laboratory spectroscopic data. This work describes new high-resolution infrared absorption cross sections of trichlorofluoromethane/dry synthetic air over the spectral range 710–1290 cm−1, determined from spectra recorded using a high-resolution Fourier transform spectrometer (Bruker IFS 125HR) and a 26-cm-pathlength cell. Spectra were recorded at resolutions between 0.01 and 0.03 cm−1 (calculated as 0.9/MOPD; MOPD = maximum optical path difference) over a range of temperatures and pressures (7.5–760 Torr and 192–293 K) appropriate for atmospheric conditions. This new cross-section dataset improves upon the one currently available in the HITRAN and GEISA databases.

scholarly journals New and improved infrared absorption cross sections for chlorodifluoromethane (HCFC-22)

2016 ◽  
Author(s):  
J. J. Harrison
Keyword(s):  
High Resolution ◽  
Cross Sections ◽  
Infrared Absorption ◽  
Stratospheric Ozone ◽  
Optical Path Difference ◽  
Path Difference ◽  
Montreal Protocol ◽  
Absorption Cross ◽  
Atmospheric Conditions ◽  
The One

Abstract. The most widely used hydrochlorofluorocarbon (HCFC) commercially since the 1930s has been chlorodifluoromethane, or HCFC-22, which has the undesirable effect ofdepleting stratospheric ozone. As this molecule is currently being phased out under the Montreal Protocol, monitoring its concentration profiles using infrared sounders cruciallyrequires accurate laboratory spectroscopic data. This work describes new high-resolution infrared absorption cross sections of chlorodifluoromethane over the spectral range 730 – 1380 cm−1, determined from spectra recorded using a high-resolution Fourier transform spectrometer (Bruker IFS 125HR) and a 26-cm-pathlength cell. Spectra of chlorodifluoromethane/dry synthetic air mixtures were recorded at resolutions between 0.01and 0.03 cm−1 (calculated as 0.9/MOPD; MOPD = maximum optical path difference) over a range of temperatures and pressures (7.5–762 Torr and 191–295 K) appropriate for atmospheric conditions. This new cross-section dataset improves upon the one currently available in the HITRAN and GEISA databases; in particular it provides coverage over a wider range of pressures and temperatures, has more accurate wavenumber scales, more consistent integrated band intensities, improved signal-to-noise, is free of channel fringing, and additionally covers the v2 and v7 bands.

16O12C17O and 18O12C17O spectroscopy in the 1.2–1.25 μm region

2013 ◽  
Vol 91 (11) ◽  
pp. 963-965 ◽  
Author(s):  
D. Golebiowski ◽  
M. Herman ◽  
O. Lyulin
Keyword(s):  
Carbon Dioxide ◽  
Fourier Transform ◽  
High Resolution ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Spectral Element ◽  
Laser Source ◽  
Enhanced Absorption ◽  
Hot Band ◽  
Infrared Absorption Spectra

Near-infrared absorption spectra of a carbon dioxide sample enriched with oxygen-17 were recorded in the spectral range 1.2–1.25 μm. A high-resolution continuous scan Fourier transform interferometer fitted with a femto OPO/Idler laser source and cavity-enhanced absorption was used. The optimal root mean squared noise equivalent absorption was 1.2 × 10−10 cm−1Hz–1/2 per spectral element, corresponding to αmin = 10−8 cm−1. Two cold bands in 17O12C18O and one hot band in 16O12C17O were newly identified and rotationally analyzed. More lines than previously published (Lyulin et al. J. Quant. Spectrosc. Radiat. Transfer, 113, 2167 (2012)), were assigned in the observed bands of 12C17O2 and 16O12C17O. New upper state rotational constants were obtained from a band-by-band analysis.

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