Large Amplitude Motions, Especially Isomerization and Tunneling in Polyatomic Molecule Spectra: Novel Experimental, Pattern Recognition, and Theoretical Methods

Abstract

Stimulated Emission Pumping (SEP) spectra of HCP imply surprisingly regular dynamics for a rigid molecule undergoing up to 300 deg bending vibrations. Optical Optical Double Resonance (OODR) spectra characterize corresponding (pi* squared reversing pi squared) doubly excited (predissociated) states of HCP and HCCH. The factors governing intensities of nominally forbidden transitions in bent yielding linear SEP spectra are analyzed; this analysis forces the conclusion that transitions into excited CH stretching levels are absent from the A (tilde)-X(tilde) SEP spectra of HCN and HCCH. All mystery transitions in Wodtke's SEP spectra of HCN are assigned. An OODR scheme has been devised for distinguishing electric dipole from magnetic dipole transitions

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Document Details

Document Type
Technical Report
Publication Date
Jul 29, 1994
Accession Number
ADA284194

Entities

People

  • Robert J. Silbey
  • Robert W. Field

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Absorption Spectra
  • Chemical Reactions
  • Chemistry
  • Computational Science
  • Emission Spectroscopy
  • High Resolution
  • Intensity
  • Isomerization
  • Molecular Dynamics
  • Molecules
  • Pattern Recognition
  • Polyatomic Molecules
  • Quantum Chaos
  • Recognition
  • Spectra
  • Spectroscopy
  • Transitions

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Solar Physics

Technology Areas

  • AI & ML
  • AI & ML - Machine Learning Algorithms