Reactions of N{sub 2}O{sub 5} with protonated water clusters H{sup +}(H{sub 2}O){sub n}, n = 3-30
- Pennsylvania State Univ., University Park, PA (United States)
Reactions of N{sub 2}O{sub 5} with protonated and deuterated water clusters X{sup +}(X{sub 2}O){sub n=3-30}, X = H or D, were studied at temperatures ranging from 128 to 300 K and at pressures between 0.23 and 0.66 Torr using a fast-flow apparatus. For cluster ions with n >= 5, the reaction X{sup +}(X{sub 2}O){sub n} + N{sub 2}O{sub 5} {yields} X{sup +}(X{sub 2}O){sub n-1} XNO{sub 3} + XNO{sub 3} was observed to occur at temperatures below 150 K. At somewhat larger values of n which were acquired at temperatures about 130 K, the product ions X{sup +}(X{sub 2}O){sub n-2}(XNO{sub 3}){sub 2} and X{sup +}(X{sub 2}O){sub n-3}(XNO{sub 3}){sub 3} were also observed. The rate constants of the thermal energy reactions of N{sub 2}O{sub 5} with X{sup +}(X{sub 2}O){sub n=5-21} were found to display both a size and pressure dependence. The present work gives the first experimental evidence for the reaction between large protonated water clusters (n >= 5) and N{sub 2}O{sub 5} under laboratory conditions, and the results provide further information for unraveling the chemistry of the upper atmosphere. 20 refs., 6 figs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 102747
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 35 Vol. 98; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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