## Abstract

Collisional dynamics of size- and translational-energy-selected protonated water clusters H^{+}(H_{2}O)_{n} (n = 2-11) in single collisions with D_{2}O were investigated using guided-ion beam tandem mass spectrometry. The dominant reaction channel for the collision involves the incorporation of D_{2}O into H^{+}(H_{2}O)_{n} at low collision energy, whereas at high collision energy, the dissociation of H^{+}(H_{2}O)_{n} is predominant. The measured total reaction cross section of H^{+}(H_{2}O)_{n} with D _{2}O is found to depend strongly on the cluster size; the cross section drastically increases as the cluster size increases from n = 4 to 5, 6 to 7, and 8 to 9 and has local minima at n = 6 and 8 at collision energies of 0.05 and 0.10 eV, respectively. The size dependence of the total cross section is discussed herein in terms of a comparison with the collision cross section obtained from ab initio calculations.

Original language | English |
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Pages (from-to) | 10904-10910 |

Number of pages | 7 |

Journal | Journal of Physical Chemistry A |

Volume | 107 |

Issue number | 50 |

DOIs | |

Publication status | Published - 2003 Dec 18 |

## ASJC Scopus subject areas

- Physical and Theoretical Chemistry

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