CaltechAUTHORS
  A Caltech Library Service

Vibrational spectroscopy of NO^+(H_2O)_n: Evidence for the intracluster reaction NO^+(H_2O)_n→H_3O^+(H_2O)_(n-2)(HONO) at n≥4

Choi, Jong-Ho and Kuwata, Keith T. and Haas, Bernd-Michael and Cao, Yibin and Johnson, Matthew S. and Okumura, Mitchio (1994) Vibrational spectroscopy of NO^+(H_2O)_n: Evidence for the intracluster reaction NO^+(H_2O)_n→H_3O^+(H_2O)_(n-2)(HONO) at n≥4. Journal of Chemical Physics, 100 (10). pp. 7153-7165. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:20120301-075332550

[img]
Preview
PDF - Published Version
See Usage Policy.

1589Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20120301-075332550

Abstract

Infrared spectra of mass‐selected clusters NO^+(H_2O)_n for n=1 to 5 were recorded from 2700 to 3800 cm^(−1) by vibrational predissociation spectroscopy. Vibrational frequencies and intensities were also calculated for n=1 and 2 at the second‐order Møller–Plesset (MP2) level, to aid in the interpretation of the spectra, and at the singles and doubles coupled cluster (CCSD) level energies of n=1 isomers were computed at the MP2 geometries. The smaller clusters (n=1 to 3) were complexes of H_2O ligands bound to a nitrosonium ion NO^+ core. They possessed perturbed H_2O stretch bands and dissociated by loss of H_2O. The H_2O antisymmetric stretch was absent in n=1 and gradually increased in intensity with n. In the n=4 clusters, we found evidence for the beginning of a second solvation shell as well as the onset of an intracluster reaction that formed HONO. These clusters exhibited additional weak, broad bands between 3200 and 3400 cm^(−1) and two new minor photodissociation channels, loss of HONO and loss of two H_2O molecules. The reaction appeared to go to completion within the n=5 clusters. The primary dissociation channel was loss of HONO, and seven vibrational bands were observed. From an analysis of the spectrum, we concluded that the n=5 cluster rearranged to form H_3O^+(H_2O)_3(HONO), i.e., an adduct of the reaction products.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.466914DOIUNSPECIFIED
http://jcp.aip.org/resource/1/jcpsa6/v100/i10/p7153_s1PublisherUNSPECIFIED
Additional Information:© 1994 American Institute of Physics. Received 3 January 1994; accepted 7 February 1994. We acknowledge support of an NSF Presidential Young Investigator Award No. CHEM-8957423, E. I. DuPont de-Nemours and Company, the Irvine Foundation, the Chevron Fund, an AT&T Special Purpose Grant, an NSF predoctoral fellowship for K. T. K,, and the JPL Supercomputer Project for the computational studies. We are grateful to Mary Frances Jagod for her heroic efforts in reprogramming the asymmetric rotor spectrum prediction program ASMWIR, and to the Materials and Molecular Simulations Center of the Beckman Institute for the graphics facilities used in generating Fig. 6.
Funders:
Funding AgencyGrant Number
NSF Presidential Young Investigator AwardCHEM-8957423
E.I. DuPont de Nemours and Company, Inc.UNSPECIFIED
Irvine Foundation UNSPECIFIED
Chevron FundUNSPECIFIED
AT&T Special Purpose GrantUNSPECIFIED
NSF Predoctoral Fellowship UNSPECIFIED
JPL Supercomputer Project for the computational studiesUNSPECIFIED
Subject Keywords:Nitrogen oxides, ions, water, molecular clusters, vibrational states, infrared spectra, predissociation, energy levels, chemical reactions
Classification Code:PACS: 36.40.-c; 82.30.Nr
Record Number:CaltechAUTHORS:20120301-075332550
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120301-075332550
Official Citation:Vibrational spectroscopy of NO+(H2O)n: Evidence for the intracluster reaction NO+(H2O)n→H3O+(H2O)n−2 (HONO) at n≥4 Jong‐Ho Choi, Keith T. Kuwata, Bernd‐Michael Haas, Yibin Cao, Matthew S. Johnson, and Mitchio Okumura J. Chem. Phys. 100, 7153 (1994); http://dx.doi.org/10.1063/1.466914
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29538
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:01 Mar 2012 17:01
Last Modified:26 Dec 2012 14:54

Repository Staff Only: item control page