Vibrational predissociation versus intramolecular vibrational energy redistribution (IVR) in rare gas∙∙∙dihalogen complexes: IVR identified in Ar∙∙∙I2(B,ν′) using velocity-map imaging

2021 ◽  
Author(s):  
Camille Makarem ◽  
Jie Wei ◽  
Richard A Loomis ◽  
Joshua P Darr
Keyword(s):  
Vibrational Energy ◽  
Van Der Waals ◽  
Van Der Waals Complexes ◽  
Rare Gas ◽  
Velocity Map Imaging ◽  
Energy Redistribution ◽  
Vibrational Predissociation ◽  
Intramolecular Vibrational Energy Redistribution ◽  
Excited Molecules

The competition between multiple pathways sampled during the energetic relaxation of excited molecules can be difficult to experimentally decipher. The rare gas···dihalogen van der Waals complexes have remained key systems...

scholarly journals From Selective to Non-Selective Vibrational Predissociation in Glyoxal van der Waals Complexes

1983 ◽  
Vol 2 (3-4) ◽  
pp. 115-123 ◽  
Author(s):  
N. Halberstadt ◽  
B. Soep
Keyword(s):  
Vibrational Energy ◽  
Van Der Waals Complexes ◽  
Excited Singlet ◽  
Energy Redistribution ◽  
Lifetime Measurements ◽  
Supersonic Expansion ◽  
Vibrational Predissociation ◽  
Intramolecular Vibrational Energy Redistribution ◽  
Vibrational Levels ◽  
State Dissociation

Vibrational predissociation (VP) of glyoxal complexes formed in a supersonic expansion, has been studied in several vibrational levels of the first excited singlet electronic state S1(1Au) of glyoxal. Light complexes as H2-glyoxal display a nice state to state dissociation. Whereas the analysis of the fluorescence spectrum, together with lifetime measurements, have shown that VP is in competition with other intramolecular vibrational energy redistribution processes in these systems, as well as inter-system crossing (ISC). Glyoxal-Ar and glyoxal-Kr behave very similarly. In particular, two isomers exist with different dissociation schemes (but similar for the same isomer of Ar or Kr-complex), and Kr does not seem to enhance ISC. Thus selectivity in the dissociation routes has to be understood as a competition between these deactivation channels.

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.

Multiple timescales in the intramolecular vibrational energy redistribution of highly excited methanol

1995 ◽  
Vol 102 ◽  
pp. 167 ◽  
Author(s):  
Lucia Lubich ◽  
Oleg V. Boyarkin ◽  
Rebecca D. F. Settle ◽  
David S. Perry ◽  
Thomas R. Rizzo
Keyword(s):  
Vibrational Energy ◽  
Energy Redistribution ◽  
Multiple Timescales ◽  
Intramolecular Vibrational Energy Redistribution

scholarly journals Intramolecular vibrational energy redistribution and the quantum ergodicity transition: a phase space perspective

2020 ◽  
Vol 22 (20) ◽  
pp. 11139-11173 ◽  
Author(s):  
Sourav Karmakar ◽  
Srihari Keshavamurthy
Keyword(s):  
Phase Space ◽  
Energy Flow ◽  
Vibrational Energy ◽  
Energy Redistribution ◽  
Quantum Ergodicity ◽  
Connected Network ◽  
Intramolecular Vibrational Energy Redistribution ◽  
Vibrational Energy Flow ◽  
Classical Phase Space

The onset of facile intramolecular vibrational energy flow can be related to features in the connected network of anharmonic resonances in the classical phase space.

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