Accession Number:

ADA399437

Title:

Nonadiabatic Processes Relevant to HEDMs and Atmospheric Chemistry

Descriptive Note:

Final rept. 15 Apr 1999-14 Dec 2001

Corporate Author:

JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

2002-02-02

Pagination or Media Count:

11.0

Abstract:

Our research focuses on the electronic structure aspects of electronically non adiabatic processes relevant to the stability and combustion of high energy density materials HEDMs and atmospheric chemistry. Our funded research has focused on two problems the reaction of BP-2 with H2 and reaction OP-3 H2O right arrow OHXsup 2II OHA2sup 2Sigma. Perhaps the most potentially influential aspect of our research is our work on how the connectivity of points conical intersection impacts nonadiabatic events. In each of these systems unanticipated aspects of the loci of these seams of conical intersection has lead to new avenues of research. In the course of our previous AFOSR funded research we demonstrated that B-H2 exhibits a confluence, an intersection of two branches of same seam of conical intersection, a feature of conical intersections unknown a decade ago. Recently we have shown that confluences can exist not just in tri-atomic molecules but in polyatomic molecules as well and developed an efficient method for locating and characterizing confluences. Our study of the OP-3 H2O reaction suggests the existence of an alternative coalescence, a subspace of nuclear coordinate space in which two distinct seam coalesce. While intersections of three states are well known when there is symmetry they appear to be essentially unknown for general polyatomic systems.

Subject Categories:

  • Atmospheric Physics
  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE