Ground transmission and emission intensity of the O2 1.27.MU.m nightglow.

Yamamoto, Hiromasa; Makino, T.; Naito, Ichiro; Sekiguchi, Hiroyuki

doi:10.5636/jgg.41.1043

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…A relative loss of O 2 ( 1 g ) by the pooling reaction (equation ( 2)) in the space between the diagnostic cells (in the range of 3-6%) was also taken into account in the calculation of P EPR . This value was put into equation (3) together with a presupposed value of the Einstein A-coefficient, and a photodiode current, I , was computed by the procedure given by equations ( 3)- (9). From the ratio of such calculated photocurrent (which is directly proportional to the presupposed A-coefficient) and the measured photocurrent, a resulting value of the A-coefficient was determined for each experiment.…”

Section: Resultsmentioning

confidence: 99%

“…Hsu et al [6] used a more precise laboratory technique for measurements of the integrated band absorption strength, and reported an A-value of 2.9 × 10 −4 s −1 . The Mlynzcak and Nesbit paper and the current interest in the Einstein coefficient for infrared absorption studies in the atmosphere prompted Pendleton et al [3] to re-examine the earlier measurements [7][8][9]. They concluded that the radiative lifetime of O 2 ( 1 g ) is about 60 min, in agreement with the Badger et al value.…”

Section: Introductionmentioning

confidence: 82%

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Experimental verification of the EinsteinA-coefficient used for evaluation of O₂(^1Delta_g) concentration in the chemical oxygen-iodine laser

Špalek

Kodymová

Stopka

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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This paper is a contribution to the current discussion on the Einstein coefficient for spontaneous emission (A-coefficient) of singlet delta oxygen, O2(g), that is often used for an evaluation of O2(g) concentration in a chemical oxygen-iodine laser (COIL). The published values of the A-coefficient vary in a wide range, corresponding to a radiative lifetime of O2(g), , from ~53 to ~151 min. This could make an evaluation of COIL operation questionable. In this paper, the Einstein A-coefficient is estimated, based on the comparison of O2(g) concentrations determined by two independent methods: electron paramagnetic resonance and emission spectroscopy. Within the accuracy of the experimental techniques used, the value of the A-coefficient resulting from our investigation is (2.24±0.40) × 10-4 s-1, corresponding to of ~74 min. This result is more consistent with the value of 2.58 × 10-4 s-1 of Badger et al [1] than with the value of 1.47 × 10-4 s-1 reported recently by Mlynczak and Nesbitt [2], who raised doubt about the Badger et al value.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 82%

Experimental verification of the EinsteinA-coefficient used for evaluation of O₂(^1Delta_g) concentration in the chemical oxygen-iodine laser

Špalek

Kodymová

Stopka

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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“…Though the ground transmission of the 02 band depends on the altitude distribution o f the 02 density and the atmospheric temperature, its variation is small. If the emitting region of the band is above 40 km, the ground transmission could be treated to be constant of 0.065 (Evans et al, 1970;Yamamoto et al,1989). The three curves show similar feature except for the 02 intensity curve in early part of the night.…”

Section: Observationmentioning

confidence: 99%

Ground-Based Measurement System of the OH Rotational Temperature.

Yamamoto

Kawakami

Sekiguchi

et al. 1995

J. geomagn. geoelec

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The ground-based airglow radiometer to measure the OH rotational temperature has been built. It consists of a rotating disc with eight interference filters in the near infrared wavelength region. To derive the rotational temperature it measures the zenith intensity of the 2P1, 3P1 and 4P1 branches of the OH(3-1) band as well as the background radiation around 1510 nm. It also measures the zenith intensities of the OH(3-l) Q branches, the OH(4-2) Q branches, and the 02 infrared atmospheric (0,0) band as well as the background radiation around 1245 nm. The error due to the detector noise corresponds to be within about 5 K for one data set obtained for 40 sec. A few observational results of the nocturnal variations of the rotational temperature are also presented.

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“…Atmospheric absorption of 94% of the 1.27 μm band airglow emission intensity often (with some exceptions) limits ground based observations to the study of the weaker, but less attenuated, (0,1) band at 1.58 μm. , Observers must usually rely on aircraft, balloon, rocket-borne , or satellite instruments to measure the (0,0) band emission; for example, the near-infrared spectrometer on the Solar Mesosphere Explorer (SME) satellite made measurements between 50 and 90 km . As well as being employed for studies of the terrestrial atmosphere, the 1.27 μm dayglow has been used to investigate ozone abundances on Mars and Venus …”

Section: Introductionmentioning

confidence: 99%

Temperature and Pressure Dependence of Line Widths and Integrated Absorption Intensities for the O₂ aΔ_g − X³Σ_g^- (0,0) Transition

Newman¹,

Orr‐Ewing²,

Newnham³

et al. 2000

J. Phys. Chem. A

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The electric-dipole forbidden a 1 ∆ g -X 3 Σ g -(0,0) band of gas-phase O 2 has been studied in absorption at wavelengths around 1.27 µm using Fourier transform spectroscopy and a long-path absorption cell. Experiments were conducted at temperatures of 294, 243, and 200 K and at pressures in the range 140-750 Torr. Both pure O 2 and a mixture of 21% O 2 /79% N 2 were studied, and line widths, integrated line intensities, and integrated absorption intensities (AIs) for the (0,0) vibrational band were measured. Integrated AIs were found to be independent of temperature, pressure, and gas composition, and the recommended value for the vibrational band from the current study is S int ) 3.210(15) × 10 -24 cm molecule -1 (1σ error) for pure 16 O 2 , corresponding to an Einstein A-coefficient of A ) 2.256(10) × 10 -4 s -1 . The effect of including other oxygen isotopomers is to increase the integrated AI value for this origin band to S int ) 3.226(15) × 10 -24 cm molecule -1 . Widths of individual spectroscopic lines decrease with increasing molecular rotational quantum number. The temperature dependence of Lorentzian line width components, γ T (fwhm), is well represented by the expression γ T ) γ 294K (T/294 K) -0.85 . The effects of pressure broadening of lines by N 2 are indistinguishable from those for pure O 2 at the same temperature and pressure.

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Ground transmission and emission intensity of the O2 1.27.MU.m nightglow.

Cited by 8 publications

References 15 publications

Experimental verification of the EinsteinA-coefficient used for evaluation of O₂(^1Delta_g) concentration in the chemical oxygen-iodine laser

Experimental verification of the EinsteinA-coefficient used for evaluation of O₂(^1Delta_g) concentration in the chemical oxygen-iodine laser

Ground-Based Measurement System of the OH Rotational Temperature.

Temperature and Pressure Dependence of Line Widths and Integrated Absorption Intensities for the O₂ aΔ_g − X³Σ_g^- (0,0) Transition

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Ground transmission and emission intensity of the O2 1.27.MU.m nightglow.

Cited by 8 publications

References 15 publications

Experimental verification of the EinsteinA-coefficient used for evaluation of O2(^1Deltag) concentration in the chemical oxygen-iodine laser

Experimental verification of the EinsteinA-coefficient used for evaluation of O2(^1Deltag) concentration in the chemical oxygen-iodine laser

Ground-Based Measurement System of the OH Rotational Temperature.

Temperature and Pressure Dependence of Line Widths and Integrated Absorption Intensities for the O2 aΔg − X3Σg- (0,0) Transition

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Experimental verification of the EinsteinA-coefficient used for evaluation of O₂(^1Delta_g) concentration in the chemical oxygen-iodine laser

Experimental verification of the EinsteinA-coefficient used for evaluation of O₂(^1Delta_g) concentration in the chemical oxygen-iodine laser

Temperature and Pressure Dependence of Line Widths and Integrated Absorption Intensities for the O₂ aΔ_g − X³Σ_g^- (0,0) Transition