scholarly journals Energy Transfer in the 2u (1D2) Ion-Pair State of I2 by Inelastic Collisions with Noble Gas Atoms

ACS Omega ◽  
2022 ◽  
Author(s):  
Shoma Hoshino ◽  
Oji Yamamoto ◽  
Koichi Tsukiyama
Keyword(s):  
Energy Transfer ◽  
Noble Gas ◽  
Ion Pair ◽  
Inelastic Collisions ◽  
Pair State

scholarly journals Theoretical and experimental studies of collision-induced electronic energy transfer from v=0–3 of the E(0g+) ion-pair state of Br2: Collisions with He and Ar

2008 ◽  
Vol 128 (18) ◽  
pp. 184311 ◽  
Author(s):  
J. Matthew Hutchison ◽  
Robin R. O’Hern ◽  
Thomas A. Stephenson ◽  
Yury V. Suleimanov ◽  
Alexei A. Buchachenko
Keyword(s):  
Energy Transfer ◽  
Experimental Studies ◽  
Electronic Energy ◽  
Ion Pair ◽  
Electronic Energy Transfer ◽  
Pair State

scholarly journals Collision-induced electronic energy transfer from v=0 of the E(0g+) ion-pair state in I2: Collisions with He and Ar

2002 ◽  
Vol 116 (4) ◽  
pp. 1361-1369 ◽  
Author(s):  
Christopher J. Fecko ◽  
Miriam A. Freedman ◽  
Thomas A. Stephenson
Keyword(s):  
Energy Transfer ◽  
Electronic Energy ◽  
Ion Pair ◽  
Electronic Energy Transfer ◽  
Pair State

Inelastic Collisions Between Excited Alkali Atoms and Molecules IX. An Isotope Effect in the Cross Sections for 62P1/2↔62P3/2 Mixing in Cesium, Induced in Collisions with Deuterated Methanes

1974 ◽  
Vol 52 (7) ◽  
pp. 584-588 ◽  
Author(s):  
E. Walentynowicz ◽  
R. A. Phaneuf ◽  
W. E. Baylis ◽  
L. Krause
Keyword(s):  
Energy Transfer ◽  
Isotope Effect ◽  
Cross Sections ◽  
Noble Gas ◽  
Inelastic Collisions ◽  
Semiclassical Theory ◽  
Vibrational States ◽  
Rotational Energy Transfer ◽  
Alkali Atoms ◽  
The Cross

The temperature dependence of cross sections for 62P1/2 ↔ 62P3/2 mixing in cesium, induced in collisions with CH4, CH3D, CH2D2, CHD3, and CD4 molecules, has been investigated in a series of sensitized fluorescence experiments over a temperature range 290–650 K. The various cross sections which are of the order of 10−15 cm2, and which exceed similar cross sections for cesium–noble gas collisions by 4 – 6 orders of magnitude, exhibit differences in their variation with temperature. This isotope effect in the collision cross sections is interpreted on the basis of a novel semiclassical theory of electronic to rotational energy transfer. The cross section for mixing induced by collisions with CF4, which was determined in a subsidiary experiment, and which is 2–3 times larger than the methane cross sections, does not show comparable behavior with temperature, probably because the energy transfer takes place to closely lying molecular vibrational states.

scholarly journals Collision-induced electronic energy transfer from v=0 of the E(0g+) ion-pair state in I2: Collisions with I2(X)

2001 ◽  
Vol 115 (9) ◽  
pp. 4132-4138 ◽  
Author(s):  
Christopher J. Fecko ◽  
Miriam A. Freedman ◽  
Thomas A. Stephenson
Keyword(s):  
Energy Transfer ◽  
Electronic Energy ◽  
Ion Pair ◽  
Electronic Energy Transfer ◽  
Pair State

scholarly journals Ionization characteristics of the Cys-25/His-159 interactive system and of the modulatory group of papain: resolution of ambiguity by electronic perturbation of the quasi-2-mercaptopyridine leaving group in a new pyrimidyl disulphide reactivity probe

1993 ◽  
Vol 290 (1) ◽  
pp. 289-296 ◽  
Author(s):  
G W Mellor ◽  
E W Thomas ◽  
C M Topham ◽  
K Brocklehurst
Keyword(s):  
Ph Dependence ◽  
Order Rate Constant ◽  
Ion Pair ◽  
Catalytic Site ◽  
Alkaline Media ◽  
Interactive System ◽  
Data Set ◽  
Pka Value ◽  
Compound Ii ◽  
Pair State

1. A new thiol-specific reactivity probe 4,4′-dipyrimidyl disulphide [compound (VII), m.p. 110 degrees C, pKa of its monohydronated form 0.91] was synthesized and used to resolve the ambiguity of interpretation of the behaviour of papain (EC 3.4.22.2) in alkaline media known to depend to varying extents on two ionizations with pKa values approx. 8.0-8.5 and > or = 9.5 respectively. 2. A new extensive pH-second-order rate constant (k) data set for the reaction of papain with 2-(acetamido)-ethyl 2′-pyridyl disulphide (IV) demonstrated the existence of a striking rate maximum at pH approx. 4, the independence of k around pH 8 and the increase in k with increase in pH across a pKa value of 10.0, behaviour similar to that of other 2-pyridyl disulphides (R-S-S-2-Py) that lack key substrate-like binding sites in R. 3. Although the simplest interpretation of the pKa value of 10.0 assigns it to the formation of (Cys-25)-S-/(His-159)-Im from the ion-pair state of the papain catalytic site, another interpretation may be conceived in which this pKa value is assigned to another group remote from the catalytic site, the state of ionization of which modulates catalytic-site behaviour. This alternative assignment is shown to require compensating effects in the pH region around 8 such that the formation of (Cys-25)-S-/(His-159)-Im across pKa 8.0-8.5 is without net kinetic effect in the reactions of simple 2-pyridyl disulphides such as compound (IV) and 2,2′-dipyridyl disulphide (II). 4. The lower basicity of compound (VII) relative to that of compound (II) (pKa 2.45) was predicted to diminish or abolish the compensation postulated as a possibility in reactions of 2-pyridyl disulphides because of the decreased effectiveness of reaction via a (His-159)-Im+H-assisted transition state. The characteristics of the pH-dependence of the reaction of papain with compound (VII) which are quite different from those for its reaction with compound (II) support both this prediction and the alternative assignment with a value of 8.3 for the pKa of the formation of (Cys-25)-S-/(His-159)-Im. 5. Evidence that the behaviour of papain towards both substrates and some substrate-derived time-dependent inhibitors is determined not only by the loss of the (Cys-25)-S-/(His-159)-Im+H ion-pair state by dehydronation with pKa 8.3 but also by another ionization of pKa approx. 10.0 is briefly discussed.

scholarly journals Breakdown of energy transfer gap laws revealed by full-dimensional quantum scattering between HF molecules

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Dongzheng Yang ◽  
Jing Huang ◽  
Xixi Hu ◽  
Hua Guo ◽  
Daiqian Xie
Keyword(s):  
Energy Transfer ◽  
Angular Momentum ◽  
Vibrational Energy ◽  
Energy Gap ◽  
Inelastic Collisions ◽  
Rate Coefficients ◽  
Quantum Scattering ◽  
Final States ◽  
Energy Gap Law ◽  
Quantitative Basis

Abstract Inelastic collisions involving molecular species are key to energy transfer in gaseous environments. They are commonly governed by an energy gap law, which dictates that transitions are dominated by those between initial and final states with roughly the same ro-vibrational energy. Transitions involving rotational inelasticity are often further constrained by the rotational angular momentum. Here, we demonstrate using full-dimensional quantum scattering on an ab initio based global potential energy surface (PES) that HF–HF inelastic collisions do not obey the energy and angular momentum gap laws. Detailed analyses attribute the failure of gap laws to the exceedingly strong intermolecular interaction. On the other hand, vibrational state-resolved rate coefficients are in good agreement with existing experimental results, validating the accuracy of the PES. These new and surprising results are expected to extend our understanding of energy transfer and provide a quantitative basis for numerical simulations of hydrogen fluoride chemical lasers.

Direct vibrational numbering of the D0u+ ion-pair state of Br2

1988 ◽  
Vol 149 (2) ◽  
pp. 155-160 ◽  
Author(s):  
R.H. Lipson ◽  
A.R. Hoy ◽  
M.J. Flood
Keyword(s):  
Ion Pair ◽  
Pair State

Time-resolved study of the lowest optically accessible ion-pair state of IBr using synchrotron radiation

1985 ◽  
Vol 31 (1) ◽  
pp. 1-5 ◽  
Author(s):  
R.J. Donovan ◽  
G. Gilbert ◽  
M. Macdonald ◽  
J.P.T. Wilkinson ◽  
I. Munro ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Ion Pair ◽  
Time Resolved ◽  
Pair State
Sign in / Sign up

Export Citation Format

Share Document