A three-dimensional wave-packet method for the CH overtone spectroscopy and intramolecular vibrational relaxation dynamics of the fluoroform molecule

1997 ◽  
Vol 106 (2) ◽  
pp. 445-456
Author(s):  
I. R. Solá ◽  
C. Muñoz-Crego ◽  
A. Dı́az ◽  
R. Muñoz-Sanz ◽  
J. Santamarı́a
Keyword(s):  
Wave Packet ◽  
Vibrational Relaxation ◽  
Three Dimensional ◽  
Relaxation Dynamics ◽  
Overtone Spectroscopy ◽  
Intramolecular Vibrational Relaxation ◽  
Dimensional Wave

The development of three-dimensional wave-packets in unbounded parallel flows

1968 ◽  
Vol 32 (4) ◽  
pp. 801-808 ◽  
Author(s):  
M. Gaster ◽  
A. Davey
Keyword(s):  
Wave Packet ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Mean Flow ◽  
Physical Plane ◽  
Parallel Flows ◽  
Flow Velocity Profile ◽  
The Stability ◽  
Special Case ◽  
Dimensional Wave

In this paper we examine the stability of a two-dimensional wake profile of the form u(y) = U∞(1 – r e-sy2) with respect to a pulsed disturbance at a point in the fluid. The disturbed flow forms an expanding wave packet which is convected downstream. Far downstream, where asymptotic expansions are valid, the motion at any point in the wave packet is described by a particular three-dimensional wave having complex wave-numbers. In the special case of very unstable flows, where viscosity does not have a significant influence, it is possible to evaluate the three-dimensional eigenvalues in terms of two-dimensional ones using the inviscid form of Squire's transformation. In this way each point in the physical plane can be linked to a particular two-dimensional wave growing in both space and time by simple algebraic expressions which are independent of the mean flow velocity profile. Computed eigenvalues for the wake profile are used in these relations to find the behaviour of the wave packet in the physical plane.

Photodissociation of CH2. II. Three‐dimensional wave packet calculations on dissociation through the first excited triplet state

1993 ◽  
Vol 99 (1) ◽  
pp. 228-236 ◽  
Author(s):  
Geert‐Jan Kroes ◽  
Ewine F. van Dishoeck ◽  
Robert A. Beärda ◽  
Marc C. van Hemert
Keyword(s):  
Wave Packet ◽  
Triplet State ◽  
Three Dimensional ◽  
Excited Triplet State ◽  
Excited Triplet ◽  
Dimensional Wave

scholarly journals Reorientation-induced relaxation of free OH at the air/water interface revealed by ultrafast heterodyne-detected nonlinear spectroscopy

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ken-ichi Inoue ◽  
Mohammed Ahmed ◽  
Satoshi Nihonyanagi ◽  
Tahei Tahara
Keyword(s):  
Hydrogen Bond ◽  
Vibrational Relaxation ◽  
Three Dimensional ◽  
Technical Difficulty ◽  
Nonlinear Spectroscopy ◽  
Water Interface ◽  
Hydrogen Bond Network ◽  
Relaxation Dynamics ◽  
Air Water Interface ◽  
Bond Network

Abstract The uniqueness of water originates from its three-dimensional hydrogen-bond network, but this hydrogen-bond network is suddenly truncated at the interface and non-hydrogen-bonded OH (free OH) appears. Although this free OH is the most characteristic feature of interfacial water, the molecular-level understanding of its dynamic property is still limited due to the technical difficulty. We study ultrafast vibrational relaxation dynamics of the free OH at the air/water interface using time-resolved heterodyne-detected vibrational sum frequency generation (TR-HD-VSFG) spectroscopy. With the use of singular value decomposition (SVD) analysis, the vibrational relaxation (T1) times of the free OH at the neat H2O and isotopically-diluted water interfaces are determined to be 0.87 ± 0.06 ps (neat H2O), 0.84 ± 0.09 ps (H2O/HOD/D2O = 1/2/1), and 0.88 ± 0.16 ps (H2O/HOD/D2O = 1/8/16). The absence of the isotope effect on the T1 time indicates that the main mechanism of the vibrational relaxation of the free OH is reorientation of the topmost water molecules. The determined sub-picosecond T1 time also suggests that the free OH reorients diffusively without the switching of the hydrogen-bond partner by the topmost water molecule.

scholarly journals A three‐dimensional wave packet study of Ar⋅ ⋅ ⋅I2(B )→Ar + I + I electronic predissociation

1996 ◽  
Vol 104 (19) ◽  
pp. 7554-7560 ◽  
Author(s):  
Octavio Roncero ◽  
Nadine Halberstadt ◽  
J. Alberto Beswick
Keyword(s):  
Wave Packet ◽  
Three Dimensional ◽  
Dimensional Wave

Three-dimensional wave packet dynamics of H2+D2 reaction

2011 ◽  
Vol 381 (1-3) ◽  
pp. 72-79 ◽  
Author(s):  
Hongwei Song ◽  
Yunpeng Lu ◽  
Soo-Y. Lee
Keyword(s):  
Wave Packet ◽  
Three Dimensional ◽  
Wave Packet Dynamics ◽  
Dimensional Wave
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