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Leshchishina, O.; Kassi, S.; Gordon, Iouli E.; Yu, Shanshan; Campargue, A.

doi:10.1016/j.jqsrt.2011.01.014

Cited by 19 publications

(17 citation statements)

References 21 publications

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“…The CAVIAR-lab measurements agree reasonably well at ~350 K with the laboratory FTS data of Baranov and Lafferty (2011), taken at several temperatures across the 4 µm window. However, there is poor agreement between these FTS data and both the measurements of Richard et al (2017), and grating spectrometer measurements of Burch and Alt (1984).…”

Section: 11: 4 μM Windowsupporting

confidence: 68%

“…However, there is poor agreement between these FTS data and both the measurements of Richard et al (2017), and grating spectrometer measurements of Burch and Alt (1984). The Richard et al (2017) and Burch and Alt (1984) agree reasonably well and imply a weaker temperature dependence than CAVIAR-lab and Baranov and Lafferty (2011). However, extrapolating only through the high-temperature CAVIAR-lab data (i.e.…”

Section: 11: 4 μM Windowmentioning

confidence: 86%

“…These higher-temperature CAVIAR-lab measurements have smaller uncertainties than the low-temperature CAVIAR-lab measurements, and appear to lie on a straight line, while the lower-temperature CAVIARlab data point does not lie on this line. There are therefore two possible experimentally-implied temperature dependences, a lower one implied by the high-temperature CAVIAR-lab, Richard et al (2017) and Burch and Alt (1984) a stronger dependence implied by the less-certain lower-temperature CAVIAR-lab, and Baranov and Lafferty (2011) measurements. This reflects the importance of making observations at lower temperature with well-constrained uncertainty…”

Section: 11: 4 μM Windowmentioning

confidence: 98%

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Atmospheric observations of the water vapour continuum in the near-infrared windows between 2500–6600 cm⁻¹

Elsey¹,

Coleman²,

Gardiner³

et al. 2019

Preprint

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Abstract. Water vapour continuum absorption is potentially important for both closure of the Earth’s energy budget and remote sensing applications. Currently, there are significant uncertainties in its characteristics in the near-infrared atmospheric windows at 2.1 and 1.6 μm. There have been several attempts to measure the continuum in the laboratory; not only are there significant differences amongst these measurements but there are also difficulties in extrapolating the laboratory data taken at room temperature or higher to atmospheric temperatures. Validation is therefore required using field observations of the real atmosphere. There are currently few published observations in atmospheric conditions with enough water vapour to detect a continuum signal within these windows, or where the self-continuum component is significant. We present observations of the near-infrared water vapour continuum from Camborne, UK at sea level using a sun-pointing, radiometrically-calibrated Fourier transform spectrometer in the window regions between 2000–10000 cm−1. Analysis of this data is challenging, particularly because of the need to remove aerosol extinction, and the large uncertainties associated with such field measurements. Nevertheless, we present data that is consistent with recent laboratory datasets in the 4 and 2.1 μm windows (when extrapolated to atmospheric temperatures). These results indicate that the most recent revision (3.2) of the MT_CKD foreign continuum, versions of which are widely used in atmospheric radiation models, requires strengthening by a factor of ~ 5 in the centre of the 2.1 µm window. In the higher-wavenumber window at 1.6 µm, our estimated self and foreign continua are significantly stronger than MT_CKD. The possible contribution of the self and foreign continua to our derived total continuum optical depth is estimated by using laboratory or MT_CKD values of one, to estimate the other. The obtained self-continuum shows some consistency with temperature-extrapolated laboratory data in the centres of the 4 and 2.1 µm windows. The 1.6 μm region is more sensitive to atmospheric aerosol and continuum retrievals and therefore more uncertain than the more robust results at 2.1 and 4 μm. We highlight the difficulties in observing the atmospheric continuum and make the case for additional measurements from both the laboratory and field, with discussion of the requirements for any new field campaign.

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Section: 11: 4 μM Windowsupporting

confidence: 68%

Section: 11: 4 μM Windowmentioning

confidence: 86%

Section: 11: 4 μM Windowmentioning

confidence: 98%

See 1 more Smart Citation

Atmospheric observations of the water vapour continuum in the near-infrared windows between 2500–6600 cm⁻¹

Elsey¹,

Coleman²,

Gardiner³

et al. 2019

Preprint

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show abstract

“…Thus, the O 2 spectroscopy must not only be good enough for reduction of possible errors in remote sensing; it must be clear in all details being based on consistent theoretical backgrounds. This is the reason for renovated interest to the theory of the dioxygen spectroscopy with high resolution and better detector sensitivity …”

Section: Analysis Of Intensity Of the Dioxygen Weak Bands In Gas Phasementioning

confidence: 99%

Dioxygen spectra and bioactivation

Minaev

Murugan

Ågren

2013

Int J of Quantum Chemistry

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Intensities of spin-forbidden transitions in electronic absorption and emission spectra of molecular oxygen are analyzed in order to understand the key mechanisms of spinstates mixing induced by spin-orbit coupling (SOC) and the ways to overcome spin prohibition for various photophysical and biochemical processes. Multireference configuration interaction calculations with SOC account are used to generalize spin-selection rules for the oxygen atmospheric and Herzberg bands in free O 2 molecule and in collision complexes. Intensity enhancement of the atmosphericupon bimolecular collisions are compared with those for Herzberg III transitions A 0 3 D u / X 3 R À g . Electric quadrupole, dipole, and magnetic approximations are used for transition probability calculations. Intensity distribution in rotational lines is also considered. With this background, we propose some simple spin-selection rules for dioxygen activation in enzymatic reactions.

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“…1 and 2). A detailed description of the fit including the weighting of the wavenumbers values of the hf components, the combination of RT and LNT datasets, the constraints of the fits of the spectroscopic parameters and comparisons with previously reported values will be detailed in a separate contribution [20]. In this Letter, we focus on the obtained hf coupling constants which are listed in Table 1 for both the ground and a 1 D g upper states.…”

Section: Resultsmentioning

confidence: 99%

Hyperfine structure of the transitions of 16O17O, 17O18O and 17O2 by CRDS at 80K

Kassi

Leshchishina

Gordon

et al. 2011

Chemical Physics Letters

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a b s t r a c tThe high sensitivity absorption spectrum of the a 1 D g À X 3 + À g band of 16 O 17 O, 17 O 18 O and 17 O 2 has been recorded by CW-Cavity Ring Down Spectroscopy near 1.27 lm. The spectra were obtained between7640 and 7917 cm À1 with a 17 O-enriched sample at room temperature and at 80 K. Due to the I = 5/2 nuclear spin of the 17 O atom, the nuclear hyperfine structure of the transitions could be partly resolved at low temperature. The parameter coupling of the nuclear spin to the electronic angular momentum in the a 1 D g state has been derived for the three studied isotopologues of oxygen.

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The a1Δg−X3Σg

Cited by 19 publications

References 21 publications

Atmospheric observations of the water vapour continuum in the near-infrared windows between 2500–6600 cm⁻¹

Atmospheric observations of the water vapour continuum in the near-infrared windows between 2500–6600 cm⁻¹

Dioxygen spectra and bioactivation

Hyperfine structure of the transitions of 16O17O, 17O18O and 17O2 by CRDS at 80K

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The a1Δg−X3Σg

Cited by 19 publications

References 21 publications

Atmospheric observations of the water vapour continuum in the near-infrared windows between 2500–6600 cm−1

Atmospheric observations of the water vapour continuum in the near-infrared windows between 2500–6600 cm−1

Dioxygen spectra and bioactivation

Hyperfine structure of the transitions of 16O17O, 17O18O and 17O2 by CRDS at 80K

Contact Info

Product

Resources

About

Atmospheric observations of the water vapour continuum in the near-infrared windows between 2500–6600 cm⁻¹

Atmospheric observations of the water vapour continuum in the near-infrared windows between 2500–6600 cm⁻¹