scholarly journals Matrix photochemistry of small molecules: Influencing reaction dynamics on electronically excited hypersurfaces

1990 ◽  
Author(s):  
S.L. Laursen
Keyword(s):  
Small Molecules ◽  
Reaction Dynamics ◽  
Electronically Excited

scholarly journals Reaction Dynamics of Electronically Excited Barium Atoms With Free Molecules and Molecular Clusters

1990 ◽  
Vol 10 (5-6) ◽  
pp. 389-403 ◽  
Author(s):  
J. M. Mestdagh ◽  
C. Alcaraz ◽  
J. Berlande ◽  
J. Cuvellier ◽  
T. Gustavsson ◽  
...  
Keyword(s):  
Molecular Beam ◽  
Reaction Dynamics ◽  
Molecular Clusters ◽  
Reaction Products ◽  
Chemiluminescent Reaction ◽  
Electronically Excited ◽  
Reaction Channels ◽  
Diallyl Ether ◽  
Free Molecules

In this review article we describe some recent results obtained in our laboratory. The successful combination of crossed molecular beam techniques and various laser excitation schemes has been used to study chemiluminescent reactions of ground and excited electronic states of barium with free molecules and molecular clusters. Studies include the identification of reaction products in cases where many chemiluminescent reaction channels are opened. The case of Ba(6sp1P1,​6s5d1D2,​6s5d3Dj) reacting with H20, methanol, ethanol, propanol-1, propanol-2, methyl-2, propanol-2, butanol-l, allyl alcohol, dimethyl ether, diethyl ether and diallyl ether is examined. A reaction mechanism is proposed which accounts for all these reactions. Studies reported in this review also include the unravelling of reaction dynamics where various forms of energy are mixed (electronic and kinetic energy). This is shown in studies of Ba(1D2​and​1P1)+O2 reactions. Finally the role of molecular clusters as reactant is examined. Evidence is provided that clusters of N20, H20 and CO2, in collision with Ba(1S0​and​1P1)+O2, do not lead efficiently to both reactive and non reactive luminescent exit channels.

Deactivation of electronically excited thallium, Tl(6p 2P3/2), in collisions with small molecules

1975 ◽  
Vol 79 (5) ◽  
pp. 414-418 ◽  
Author(s):  
P. D. Foo ◽  
T. Lohman ◽  
J. Podolske ◽  
J. R. Wiesenfeld
Keyword(s):  
Small Molecules ◽  
Electronically Excited

Ultrafast reaction dynamics of electronically excited à state of ammonia clusters

1993 ◽  
Vol 99 (1) ◽  
pp. 755-757 ◽  
Author(s):  
S. Wei ◽  
J. Purnell ◽  
S. A. Buzza ◽  
A. W. Castleman
Keyword(s):  
Reaction Dynamics ◽  
Electronically Excited ◽  
Ammonia Clusters

scholarly journals Reaction Dynamics of Electronically Excited Calcium Atom

1992 ◽  
Vol 12 (1-2) ◽  
pp. 123-136 ◽  
Author(s):  
E. Verdasco ◽  
M. Menéndez ◽  
M. Garay ◽  
A. González Ureña ◽  
O. Benoist D'azy ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Collision Energy ◽  
Low Voltage ◽  
Relative Concentration ◽  
Reaction Dynamics ◽  
The Other ◽  
Calcium Atom ◽  
Dc Discharge ◽  
Electronically Excited

Absolute values of the total chemiluminescence cross-section for the beam-gas Ca(3P, 1D) + Cl4C → CaCl(A, B) + Cl3C and Ca(3P, 1D) + SF6 → CaF(A, B) + SF5 reactions have been measured at low collision energy, ET = 0.15 and 0.14eV, respectively. Both metastable atomic calcium states Ca(3P, 1D) were produced under low voltage dc-discharge conditions. By changing the discharge conditions, different metastable concentrations were produced to measure the state-to-state cross-section for both 3P and 1D reactions. The following values for the total chemiluminescence cross-sections were obtained:σD1 = 1.77 Å and σP3 = 0.25 Å for the Ca(3P, 1D) + Cl4C → CaCl(A, B) + Cl3C reaction.σD1 = 0.59 Å2 and σP3 = 0.56 Å2 for the Ca(3P, 1D) + SF6 → CaF(A) + SF5 reaction.σD1 = 0.04 Å2 and σP3 = 0.12 Å for the Ca(3P, 1D) + SF6 → CaF(B) + SF5 reaction.In addition, beam-beam experiments were carried out at the same average low collision energy that of the beam-gas, and therefore, normalization between both experiments was possible. This procedure allowed us to obtain the excitation function of the Ca(1D) + SF6 reaction in absolute values over the 0.15–0.60eV collision energy range.On the other hand, by simulation, the ratio of CaCl(B-X/A-X) emissions intensities was found to be of 0.15. The variation of this ratio with the relative concentration of 1D/3P in a Broida oven leads to the conclusion that this state favours the formation of the B state in the chemiluminescent Ca(3P, 1D) + CH3CHCl2 → CaCl(A, B) + CH3CHCl reaction.

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