Collisional Deactivation Rates of N2+ (B2Σu+)

1971 ◽  
Vol 49 (8) ◽  
pp. 1268-1271 ◽  
Author(s):  
G. I. Mackay ◽  
R. E. March
Keyword(s):  
Electron Beam ◽  
Charge Transfer ◽  
Rate Constants ◽  
Electron Beam Excitation ◽  
Vibrational Levels ◽  
Most Probable Mode ◽  
Electronically Excited ◽  
State Charge ◽  
Beam Excitation

Electron beam excitation of nitrogen was utilized to produce ions in the zeroth and first vibrational levels of the B2Σu+ state. The rate constants for the collisional deactivation of electronically excited N2+, for each of N2 and NO, were determined individually for the v′ = 0 and v′ = 1 vibrational levels of the N2+(B2Σu+) state. Charge transfer is the most probable mode of deactivation.

Collisional Deactivation Rates of Electronically Excited Molecular Ions. III.

1972 ◽  
Vol 50 (15) ◽  
pp. 2516-2517
Author(s):  
G. I. Mackay ◽  
J. P. Anglesey ◽  
R. E. March
Keyword(s):  
Electron Beam ◽  
Charge Transfer ◽  
Rate Constants ◽  
Molecular Ions ◽  
Electron Beam Excitation ◽  
Electronically Excited ◽  
State Rate ◽  
Beam Excitation

Electron beam excitation of oxygen was utilized to produce ions in the [Formula: see text] state. Rate constants for the deactivation of [Formula: see text] for each of O2 and N2 were determined. Charge transfer is a possible mode of deactivation.

Revised Rate Constants for Quenching Reactions of Excited CO2+, N2O+, and N2+

1974 ◽  
Vol 52 (3) ◽  
pp. 426-428 ◽  
Author(s):  
C. G. Freeman ◽  
L. F. Phillips
Keyword(s):  
Electron Beam ◽  
Rate Constants ◽  
Absorption Coefficients ◽  
Quenching Of Fluorescence ◽  
Electron Beam Excitation ◽  
Beam Excitation

Data for the quenching of fluorescence excited by 58.4 nm irradiation of CO2, N2O, and N2 have been recalculated in the light of improved absorption coefficients for 58.4 nm radiation. The new rate constants for quenching of CO2+ are in better agreement with results obtained from experiments with electron beam excitation; for N2+ the disagreement is greater than before.

Fluorescence Quenching of Aminodiphenylamines with Chloromethanes

2002 ◽  
Vol 67 (8) ◽  
pp. 1154-1164 ◽  
Author(s):  
Nachiappan Radha ◽  
Meenakshisundaram Swaminathan
Keyword(s):  
Charge Transfer ◽  
Fluorescence Quenching ◽  
Ground State ◽  
Rate Constants ◽  
Quenching Mechanism ◽  
Quenching Rate ◽  
Charge Transfer Interaction ◽  
Electronically Excited ◽  
A Charge

The fluorescence quenching of 2-aminodiphenylamine (2ADPA), 4-aminodiphenylamine (4ADPA) and 4,4'-diaminodiphenylamine (DADPA) with tetrachloromethane, chloroform and dichloromethane have been studied in hexane, dioxane, acetonitrile and methanol as solvents. The quenching rate constants for the process have also been obtained by measuring the lifetimes of the fluorophores. The quenching was found to be dynamic in all cases. For 2ADPA and 4ADPA, the quenching rate constants of CCl4 and CHCl3 depend on the viscosity, whereas in the case of CH2Cl2, kq depends on polarity. The quenching rate constants for DADPA with CCl4 are viscosity-dependent but the quenching with CHCl3 and CH2Cl2 depends on the polarity of the solvents. From the results, the quenching mechanism is explained by the formation of a non-emissive complex involving a charge-transfer interaction between the electronically excited fluorophores and ground-state chloromethanes.

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