scholarly journals Isotope Effect in the Vibrational Predissociation of van der Waals Molecules: Complexes of Glyoxal With H2 and D2

1982 ◽  
Vol 1 (1) ◽  
pp. 77-82 ◽  
Author(s):  
J. A. Beswick ◽  
N. Halberstadt ◽  
C. Jouvet ◽  
B. Soep
Keyword(s):  
Fluorescence Spectrum ◽  
Isotope Effect ◽  
Van Der Waals ◽  
Branching Ratios ◽  
Van Der Waals Complexes ◽  
Distorted Wave ◽  
Final State ◽  
Supersonic Expansion ◽  
Vibrational Predissociation ◽  
Tunable Dye Laser

In this work photodissociation studies of glyoxal-H2 (D2) molecules have been conducted in order to analyze the effect of the mass in the vibrational predissociation of van der Waals complexes. The glyoxal-H2 (D2) molecules have been formed in a supersonic expansion and photodissociated by means of a tunable dye laser. The final state of the glyoxal fragments has been determined by the analysis of the fluorescence spectrum. A significant isotope effect on the branching ratios for predissociation has been found. An interpretation in terms of a distorted wave diabatic treatment is presented.

scholarly journals Consecutive Vibrational Redistribution and Predissociation Processes in s-Tetrazine–Argon Van Der Waals Complexes

1983 ◽  
Vol 2 (3-4) ◽  
pp. 125-135 ◽  
Author(s):  
J. J. F. Ramaekers ◽  
L. B. Krijnen ◽  
H. J. Lips ◽  
J. Langelaar ◽  
R. P. H. Rettschnick
Keyword(s):  
Decay Time ◽  
Van Der Waals ◽  
Stagnation Pressure ◽  
Van Der Waals Complexes ◽  
Supersonic Expansion ◽  
Vibrational Predissociation ◽  
Out Of Plane ◽  
Spectrally Resolved ◽  
Plane Mode

s-Tetrazine argon complexes T−Arn (n = 1, 2) are formed in a supersonic expansion of argon seeded with s-tetrazine. The expansion was conducted through a nozzle of 50 or 100 μm with an argon stagnation pressure between 1 and 1.5 bar. From spectrally resolved measurements it is clear that vibrational redistribution processes as well as vibrational predissociation processes take place after SVL excitation within the complex.From rise and decay time experiments it can be concluded, that after excitation of the 6a1 complex level, the above mentioned processes are consecutive and not parallel. It appears that the out of plane mode 16a couples with the Van der Waals stretching mode. The predissociation rate of the 16a2 complex is observed to be 2.3 × 109 s−1.

Vibrational predissociation dynamics and internal rotation in aromatic van der Waals complexes

1994 ◽  
Vol 59 (4) ◽  
pp. 397-402 ◽  
Author(s):  
B. D. Gilbert ◽  
C. S. Parmenter ◽  
M. -C. Su ◽  
H. -K. Oh ◽  
Z. -Q. Zhao
Keyword(s):  
Internal Rotation ◽  
Van Der Waals ◽  
Van Der Waals Complexes ◽  
Vibrational Predissociation
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