Some Reactions of OH(<i>v</i> = 1)

Spencer, John E.; Glass, G.

doi:10.1002/kin.550090110

Cited by 49 publications

(32 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In turn, the QCT result (Varandas, 2004a) with OH(v = 1) for T = 255 K [300 K] is (4.6 ± 0.2) × 10 −11 cm 3 s −1 [(4.0 ± 0.3) × 10 −11 cm 3 s −1 ], in very good agreement with the experimental and recommended values. The value utilized by Adler-Golden (1997) originates from the experimental work of Spencer and Glass (1977). However, because the relaxation rate constant for v > 1 was unknown, AG adopted a vibrationally independent effective quenching equal to twice the value of the experimental total removal rate, namely 20 × 10 −11 cm 3 s −1 .…”

Section: Kinetics Mechanism and Input Datamentioning

confidence: 99%

“…Although reproducing the rocket observations of the nightglow , a limitation of the Adler-Golden (1997) work is associated with the O + OH(v) reaction. Since the relaxation rate constant for v > 1 was unknown, a vibrationally independent effective quenching was fixed at twice the value of the experimental total removal rate (Spencer and Glass, 1977). Such a value seems to be corroborated (Pickett et al, 2006) by upper atmospheric measurements, although it has also been questioned (von Clarmann et al, 2010) since its use results in predictions of a smaller population of hydroxyl radicals than observed.…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Implications of the O + OH reaction in hydroxyl nightglow modeling

2013

View full text Add to dashboard Cite

Abstract. The hydroxyl nightglow has been examined anew using calculated rate constants for the key reactive and inelastic O + OH(v ) quenching processes. These constants have been obtained from quasiclassical trajectories run on the adiabatic ab initio-based double many-body expansion-IV potential energy surface for the ground state of the hydroperoxil radical. Significant differences in the vertical profiles of vibrationally excited hydroxyl radicals are obtained relative to the ones predicted by Adler-Golden (1997) when employing an O + OH(v ) effective rate constant chosen to be twice the experimental value for quenching of OH(v = 1). At an altitude of 90 km, such deviations range from ∼ 80 % for v = 1 to only a few percent for v = 9. Other mechanisms reported in the literature have also been utilized, in particular those that loosely yield lower and upper limits in the results, namely sudden-death and collisional cascade. Finally, the validity of the steady-state hypothesis is analysed through comparison with results obtained via numerical integration of the master equations.

show abstract

Section: Kinetics Mechanism and Input Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Implications of the O + OH reaction in hydroxyl nightglow modeling

2013

View full text Add to dashboard Cite

show abstract

“…The quenching of OH(v) by O atoms (reactions (5a) and (5b)) is critical for establishing the populations of the v < 5 states but is much less important for the higher-v states examined in this study. The total removal rate for v = 1 has been measured as 1 x 1040 cm 3 (molecules s) 4 at 300 ø K [Spencer and Glass, 1977] We next consider the quenching of OH(v) by the major atmospheric gases (reactions (3) and (4)), which is important for v > 5. The rate constants may be specified by total removal rate constants and branching ratios for populating the lower v states.…”

Section: 969mentioning

confidence: 99%

Kinetic parameters for OH nightglow modeling consistent with recent laboratory measurements

1997

View full text Add to dashboard Cite

Abstract. An improved kinetic model for the Meinel bands.of OH has been constructed from rate constants and Einstein A coefficients derived in recent laboratory experiments. Using a semiempirical parameterization of the state-to-state rate constants for OH(v) quenching by 02, the absolute OH(v) nightglow radiances are modeled to within the accuracies of the atmospheric constituent concentrations and the radiometric calibrations. Collisional quenching is found to be predominantly multiquantum at high v but single-quantum at low v.

show abstract

“…Somewhat surprisingly, Glass et al [33,34] find NO to be approximately seven times more efficient in deactivating OHt(1) than H20. For OHt(9), the reverse is true.…”

Section: Comparison To Studies Of O H F ( 1 )mentioning

confidence: 96%

Relative rate constants for removal of vibrationally excited OH(X²π_i)_v=9 by some small molecules at room temperature

Finlayson-Pitts

Toohey

Ezell

1983

Int J of Chemical Kinetics

View full text Add to dashboard Cite

Vibrationally excited OH in u = 9 [designated OHf(9)] was generated by the reaction of hydrogen atoms with ozone in a fast-flow discharge system at 300 f 3 K and a total pressure of 1.1 f 0.1 torr, with argon as the carrier gas. The addition of a species X, which can deactivate the OHt(9) or react with it, led to a decrease in the Meinel band chemiluminescent emission intensities at both 626 nm (9 -3 band) and 519 nm (9 -2 band), which were monitored as a function of the concentration of X. Application of the kinetic scheme developed previously for this chemical system gave the relative rate constant for the removal of OHt (9) fO.Ol;N203.5f0.4;N017.7f 1.5;H2074.3+2.9;DzO57.6f2.0;NH361.3f1.9;ND358.7 f 1.6; SO2 7.1 f 1.4; COS 8.4 f 1.7; H2S 33.7 f 8.4; CHa 1.56 f 0.03; CDI 1.06 f 0.06. Application of these relative rate constants to conditions in the upper atmosphere (60-100 km) suggests that OHt(9) is removed primarily by deactivation by 0 2 , and at altitudes 290 km, possibly by O(3P). However, since 0 2 is unusually efficient for a homonuclear diatomic in deactivating OH+(9), it may not be the primary deactivator for the lower ( u _< 8) vibrational levels. These results are compared to earlier studies of OHt (9), and possible mechanisms of interaction of OHt(9) with these molecules are discussed.

show abstract

Some Reactions of OH(v = 1)

Cited by 49 publications

References 33 publications

Implications of the O + OH reaction in hydroxyl nightglow modeling

Implications of the O + OH reaction in hydroxyl nightglow modeling

Kinetic parameters for OH nightglow modeling consistent with recent laboratory measurements

Relative rate constants for removal of vibrationally excited OH(X²π_i)_v=9 by some small molecules at room temperature

Contact Info

Product

Resources

About

Some Reactions of OH(v = 1)

Cited by 49 publications

References 33 publications

Implications of the O + OH reaction in hydroxyl nightglow modeling

Implications of the O + OH reaction in hydroxyl nightglow modeling

Kinetic parameters for OH nightglow modeling consistent with recent laboratory measurements

Relative rate constants for removal of vibrationally excited OH(X2πi)v=9 by some small molecules at room temperature

Contact Info

Product

Resources

About

Relative rate constants for removal of vibrationally excited OH(X²π_i)_v=9 by some small molecules at room temperature