Spectroscopic studies of intracluster chemistry

Jong Ho Choi, Mitchio Okumura

Research output: Contribution to journalConference articlepeer-review


Infrared predissociation spectroscopy of ion-solvent clusters has allowed us to examine the effects of sequential hydration on the reactivity of cations such as NO+, NO2+, and protonated formaldehyde, H2COH+, stable gas phase ions which are known to undergo rapid reactions in aqueous solution. Our experiments demonstrate that these ions undergo hydration reactions at critical cluster sizes. The smaller clusters have spectra characteristic of H2O ligands bound to stable ion cores, but as the cluster size increases, there is a sudden onset for intracluster rearrangements, e.g. NO2++ H2O → H3O+ + HNO3 which occurs upon hydration with four water molecules. With this approach, we can probe microscopic aspects of solvent effects on chemical reactions including the hydration of carbonyls and acidcatalyzed hydrolysis of amides.

Original languageEnglish
Pages (from-to)205-212
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1994 Jun 17
EventLaser Techniques for State-Selected and State-to-State Chemistry II 1994 - Los Angeles, United States
Duration: 1994 Jan 231994 Jan 29

Bibliographical note

Publisher Copyright:
© 1994 SPIE. All rights reserved.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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