Classical estimates of the numbers of normal, local and stochastic states of polyatomic molecules as functions of energy: applications to H/sub 2/O

Technical Report · Sat Jan 01 04:00:00 EST 1983

DOI:https://doi.org/10.2172/6182494· OSTI ID:6182494

Ruf, B A; Muckerman, J T; Ashton, C J; Noid, D W

For a general polyatomic molecule, the classical phase space at some fixed energy and angular momentum is divisible into two regimes: a quasiperiodic and a stochastic (or chaotic) regime. In certain molecules - those having symmetrically equivalent X-H bonds, where X is any heavy atom - the classical trajectories comprising the quasiperiodic regime can be subdivided into two classes: normal trajectories, for which the time-averaged amplitudes in all the X-H stretching vibrations are equivalent, and local trajectories, which exhibit a permanent imbalance in the amplitudes of the various X-H stretching vibrations. We report here the development of trajector diagnostics for bound, nonseparable motion to distinguish normal, local, and stochastic types of motion in systems with more than two internal (coordinate) degrees of freedom, and the application of these diagnostics to determine the numbers of normal, local, and stochastic states of a realistic model of nonrotating H/sub 2/O as functions of energy. This application is the first such study for a real polyatomic molecule.

• Research Organization: Brookhaven National Lab., Upton, NY (USA); Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6182494
• Report Number(s): BNL-32706; CONF-830433-1; ON: DE83009727
• Country of Publication: United States
• Language: English

Related Subjects

640305* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Theory-- (-1987)
74 ATOMIC AND MOLECULAR PHYSICS
CHEMICAL BONDS
DATA
ENERGY LEVELS
EXCITED STATES
HYDROGEN COMPOUNDS
INFORMATION
MOLECULAR STRUCTURE
MOLECULES
NUMERICAL DATA
OXYGEN COMPOUNDS
POLYATOMIC MOLECULES
STOCHASTIC PROCESSES
THEORETICAL DATA
VIBRATIONAL STATES
WATER