Nitrogen- and water-broadening coefficient measurements in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si5.gif" overflow="scroll"><mml:mrow><mml:mover accent="true"><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mi>˜</mml:mi></mml:mrow></mml:mover><mml:msup><mml:mrow /><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup><mml:mi>←</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi

Kanno, Nozomu; Tonokura, Kenichi; Tezaki, Atsumu; Koshi, Mitsuo

doi:10.1016/j.jms.2004.09.005

Cited by 19 publications

(15 citation statements)

References 16 publications

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“…On the basis of the theory described by Avetisov and Kauranen [1996], absorption peak shapes were retrieved through nonlinear least squares fittings assuming the Voigt profile. Details for fitting procedures were described in the previous paper [ Kanno et al , 2005a].…”

Section: Resultsmentioning

confidence: 99%

“…At 250 K, their reported value (4.1 ± 1.1) × 10 −17 cm 3 molecule −1 was larger than (6.0 ± 1.5) × 10 −18 cm 3 molecule −1 obtained in the present study. At higher water concentrations, absorption peak width is expected to be greater because of large pressure broadening coefficient of water [ Kanno et al , 2005a]. In the present study, water influence on absorption peak width was excluded in the spectrum fitting procedure.…”

Section: Resultsmentioning

confidence: 99%

“…Experiments were carried out using pulsed laser photolysis/continuous wave two‐tone frequency modulation (TTFM) absorption spectroscopy. The apparatus used in the present study has been described elsewhere [ Kanno et al , 2005a, 2005b]. The photolysis laser beam was introduced into the center of a quartz glass tube reactor (46 mm i.d.)…”

Section: Methodsmentioning

confidence: 99%

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Equilibrium constant of the HO₂‐H₂O complex formation and kinetics of HO₂ + HO₂‐H₂O: Implications for tropospheric chemistry

2006

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[1] Complex formation between HO 2 and H 2 O and kinetics of the HO 2 -H 2 O complex were investigated using near-infrared two-tone frequency modulation spectroscopy at 250-350 K and 50 torr with N 2 diluent. From the depletion of the HO 2 signal in the presence of water, the equilibrium constant of the HO 2 -H 2 O complex formation was estimated. The stabilized energy of the HO 2 -H 2 O complex formation was estimated to be 31 ± 4 kJ mol À1 , and it was suggested that the complex has two hydrogen bonds. Using the equilibrium constant obtained from spectral measurements, the rate constant of the reaction HO 2 + HO 2 -H 2 O was estimated at 297-350 K and 50 torr with N 2 diluent. Weak dependence of the rate constant on temperature indicated that the temperature dependence of water effects on HO 2 self-reaction kinetics was mainly controlled by that of the equilibrium constant of the HO 2 -H 2 O complex formation. Altitude profiles of HO 2 -H 2 O complexes and HO 2 self-reaction rate were also estimated in the northwest Pacific Ocean. The importance of HO 2 -H 2 O complexes in the lower troposphere was suggested.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Equilibrium constant of the HO₂‐H₂O complex formation and kinetics of HO₂ + HO₂‐H₂O: Implications for tropospheric chemistry

2006

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“…Therefore, we rather suspect a systematic error in the absorption cross-sections used for both pressures: in order to calculate the absorption cross-section at the maximum of an absorption line at a given pressure from the line strength (6.34 10 À21 cm À1 ), line broadening has to be taken into account. However, broadening coefficients for HO 2 radical absorption lines are sparse, [6,14,15] and to our knowledge only one measurement in helium [6] is known for the absorption line at 6637.29 cm À1 : g He = 0.057 cm À1 atm À1 . Concerning the absorption line used in this work (6638.20 cm À1 ), to the best of our knowledge, nothing is known about its broadening coefficient.…”

Section: Ho 2 Concentration-time Profiles As a Function Of O 2 Concenmentioning

confidence: 99%

HO₂ Formation from the Photoexcitation of Benzene/O₂ Mixtures at 248 nm: An Energy Dependence Study

et al. 2010

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The energy dependence of HO(2) radical formation from the irradiation of benzene (C(6)H(6)) in the presence of oxygen (O(2)) at 248 nm is studied. We investigate the origin of the HO(2) radicals, that is, whether they originate from the reaction of O(2) with products obtained by one- or two-photon excitation of C(6)H(6). The concentration-time profiles of HO(2) radicals are monitored by continuous-wave cavity ring-down spectroscopy (cw-CRDS) coupled to a laser photolysis reactor. HO(2) radicals are detected in the first vibrational overtone of the OH stretch at 6638.20 cm(-1), using a distributed feedback (DFB) diode laser. Two well-distinguished HO(2) radical-formation phases are observed: a fast initial formation of HO(2) radicals followed by a slower secondary formation. While the concentration of the initially formed HO(2) species increases linearly with the excitation energy, the concentration of the secondary slow HO(2) radicals appears to vary in accordance with a two-photon process.

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“…HNO 3 lines broadened by air (E) (Cazzoli et al 2005). HO 2 lines broadened by air (E) ); H 2 O and N 2 (E) (Kanno et al 2005). HI lines broadened by HI (E) (Bulanin et al 2005, Hartmann et al 2005; He (E) .…”

Section: Broadening and Shift Of Molecular Linesmentioning

confidence: 99%

Division Xii / Commission 14 / Working Group Collision Processes

Peach¹,

Dimitrijević²,

Stancil³

2008

Proc. IAU

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Research in atomic and molecular collision processes and spectral line broadening has been very active since our last report (Schultz & Stancil 2007, Allard & Peach 2007). Given the large volume of the published literature and the limited space available, we have attempted to identify work most relevant to astrophysics. Since our report is not comprehensive, additional publications can be found in the databases at the web addresses listed in the final section. Elastic and inelastic collisions among electrons, atoms, ions, and molecules are included and reactive processes are also considered, but except for charge exchange, they receive only sparse coverage.

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Nitrogen- and water-broadening coefficient measurements in the A˜2A′←

Cited by 19 publications

References 16 publications

Equilibrium constant of the HO₂‐H₂O complex formation and kinetics of HO₂ + HO₂‐H₂O: Implications for tropospheric chemistry

Equilibrium constant of the HO₂‐H₂O complex formation and kinetics of HO₂ + HO₂‐H₂O: Implications for tropospheric chemistry

HO₂ Formation from the Photoexcitation of Benzene/O₂ Mixtures at 248 nm: An Energy Dependence Study

Division Xii / Commission 14 / Working Group Collision Processes

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Nitrogen- and water-broadening coefficient measurements in the A˜2A′←

Cited by 19 publications

References 16 publications

Equilibrium constant of the HO2‐H2O complex formation and kinetics of HO2 + HO2‐H2O: Implications for tropospheric chemistry

Equilibrium constant of the HO2‐H2O complex formation and kinetics of HO2 + HO2‐H2O: Implications for tropospheric chemistry

HO2 Formation from the Photoexcitation of Benzene/O2 Mixtures at 248 nm: An Energy Dependence Study

Division Xii / Commission 14 / Working Group Collision Processes

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Equilibrium constant of the HO₂‐H₂O complex formation and kinetics of HO₂ + HO₂‐H₂O: Implications for tropospheric chemistry

Equilibrium constant of the HO₂‐H₂O complex formation and kinetics of HO₂ + HO₂‐H₂O: Implications for tropospheric chemistry

HO₂ Formation from the Photoexcitation of Benzene/O₂ Mixtures at 248 nm: An Energy Dependence Study