PMID- 9878496
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20191120
IS  - 0022-2852 (Print)
IS  - 0022-2852 (Linking)
VI  - 193
IP  - 1
DP  - 1999 Jan
TI  - Intramolecular Vibrational Dynamics of the Asymmetric &dbond;CH2 Hydride Stretch 
      of Isobutene.
PG  - 159-165
AB  - The eigenstate-resolved, high-resolution (5 MHz) infrared spectrum of the 
      asymmetric &dbond;CH2 hydride stretch of isobutene has been measured using an 
      electric resonance optothermal spectrometer (EROS). This vibrational band near 
      3087 cm-1 was rotationally assigned with ground state microwave-infrared 
      double-resonance spectroscopy. IVR rates from rotationally homogeneous IVR 
      multiplets at values of total angular momentum, J ranging from J = 0 to J = 3 and 
      Ka values of Ka = 0 to Ka = 2, were obtained. The average IVR lifetime for this 
      vibrational mode is 105 ps and independent of rotational state. The experimental 
      state density of the rotationless 000 vibrational state, approximately 150 
      states/cm-1, is in good agreement with the direct count result of 99 states/cm-1 
      using the C+3 v multiply sign in circle C-3 v (G36) molecular symmetry group. The 
      lineshape profiles of the IVR multiplets are investigated in order to elucidate 
      information concerning the dependence of IVR rates on the symmetry of the 
      torsional wavefunction. We find that there is a common IVR rate among the various 
      torsional symmetries. IVR lifetimes observed in the present study are compared to 
      other asymmetric ethylenic hydride stretch IVR rates measured in our laboratory. 
      Copyright 1999 Academic Press.
FAU - McWhorter, DA
AU  - McWhorter DA
AD  - Department of Chemistry, University of Virginia, McCormick Road, Charlottesville, 
      Virginia, 22902
FAU - Pate, BH
AU  - Pate BH
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Mol Spectrosc
JT  - Journal of molecular spectroscopy
JID - 2985089R
EDAT- 1999/05/18 00:00
MHDA- 1999/05/18 00:01
CRDT- 1999/05/18 00:00
PHST- 1999/05/18 00:00 [pubmed]
PHST- 1999/05/18 00:01 [medline]
PHST- 1999/05/18 00:00 [entrez]
AID - jmsp.1998.7733 [pii]
AID - 10.1006/jmsp.1998.7733 [doi]
PST - ppublish
SO  - J Mol Spectrosc. 1999 Jan;193(1):159-165. doi: 10.1006/jmsp.1998.7733.