Cross sections for reactions of OHH2O with NO2 are reported for interaction energies from 0.2 to 6 eV. Reactions producing the ions HNO3 and NO2H2O were observed, in addition to charge transfer and collisional dissociation. These reactions were not observable at an interaction energy of 0.04 eV. Based upon these results, upper and lower bounds for the electron affinity of HNO3 are 0.39⩽E.A.(HNO3)⩽0.73 eV and for the bond dissociation energy of NO2H2O are 0.1⩽D(NO2H2O) 0.6 eV. It is suggested that the strong energy dependence of the cross sections for the reactions forming HNO−3 and NO2H2O is the result of dissociation of these ions before detection.

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The value of 2.95±0.15 eV has been reported by
S.
Golub
and
B.
Steiner
,
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49
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5191
(
1968
). The value used in the text may be derived from the values for E. A. (OH) given in Ref. 9 and for D(OHH2O) given in Ref. 7, assuming that D(OHH2O) is negligible.
5.
S. B.
Woo
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E. M.
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(
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8.
This value was calculated from heats of formation given by S. W. Benson, Thermochemical Kinetics, 2nd ed. (Wiley, New York, 1976).
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H.
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T. A.
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B. P.
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E. W.
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R. G.
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See for example
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508
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15.
The value used in the text may be derived from the values for E. A. (NO2) given in Ref. 5 and for D(NO2H2O) given in Ref. 13, assuming that D(NO2H2O) is negligible. An identical result is reported in Ref. 6.
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