Calculation of the quenching rate constants for electronically excited singlet molecular nitrogen

2011 ◽  
Vol 56 (12) ◽  
pp. 1731-1736 ◽  
Author(s):  
A. S. Kirillov
Keyword(s):  
Rate Constants ◽  
Molecular Nitrogen ◽  
Excited Singlet ◽  
Quenching Rate ◽  
Electronically Excited

Quenching of Fluorescence of Chloropentafluoroacetone by Saturated Hydrocarbons

1972 ◽  
Vol 50 (9) ◽  
pp. 1429-1432 ◽  
Author(s):  
A. J. Yarwood
Keyword(s):  
Gas Phase ◽  
Rate Constants ◽  
Singlet State ◽  
Fluorescence Yield ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Quenching Rate ◽  
Saturated Hydrocarbons ◽  
Phase Measurements ◽  
Electronically Excited

Saturated hydrocarbons can quench the electronically excited singlet state of a simple ketone in the gas phase. Measurements on the quenching of the fluorescence yield of chloropentafluoroacetone at 23 °C show that different saturated hydrocarbons can deactivate the excited singlet state with varying efficiencies. The quenching rate constants are reported and possible relationships considered.

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.

scholarly journals Measurements of rate constants of O2(b) quenching by CH4, NO, N2O at temperatures 300-800 K

2018 ◽  
Vol 209 ◽  
pp. 00006
Author(s):  
G.I. Tolstov ◽  
M.V. Zagidullin ◽  
N.A. Khvatov ◽  
I.A. Medvedkov ◽  
A.M. Mebel ◽  
...  
Keyword(s):  
Rate Constants ◽  
Room Temperature ◽  
Quenching Rate ◽  
Important Place ◽  
The Past ◽  
Tunable Dye Laser ◽  
Deactivation Kinetics ◽  
Electronically Excited ◽  
Excited Oxygen ◽  
Good Agreement

Electronically excited oxygen has an important place in the kinetic schemes of the processes taking place in the atmosphere, in the active medium of an oxygen-iodine laser, and in plasma-assisted combustion1. Over the past decades, a large amount of data on the rate constants of quenching O2(b) on a large number of collision partners has been accumulated. However, they mostly refer to the results of measurements at room temperature. In this paper, rate constants for the quenching of O2(b) by collisions with N2O, NO, and CH4 have been determined in the temperature range from 297 to 800 K, by the laser-induced fluorescence method. O2(b) was excited by pulses from a tunable dye laser, and the deactivation kinetics were followed via observing the temporal behavior of the b1Σg+→ X3Σg- fluorescence. From the analysis of experimental results, the following temperature dependencies of the quenching rate constants by these gases were obtained, and could be represented by the expressions: kNO=(1.77±0.2)×10-24×T3.5 exp(1138±37/T); kN2O=(2.63±0.14)×10-16×T1.5×exp(590±26/T) and kCH4=(3.54±0.4)×10-18×T1.5×exp(-220±24/T) cm3s-1. All of the rate constants measured at room temperature were found to be in good agreement with previously reported values.

Fluorescence Lifetime and Quenching Rates for N,N,N′,N′-Tetramethyl-P-Phenylenediamine in the Vapor Phase

1989 ◽  
Vol 43 (8) ◽  
pp. 1406-1409 ◽  
Author(s):  
S. K. Nickle ◽  
L. A. Melton
Keyword(s):  
Vapor Phase ◽  
Fluorescence Lifetime ◽  
Ground State ◽  
Rate Constants ◽  
Quenching Rate ◽  
Electronically Excited ◽  
Visualization Systems ◽  
Fuel Evaporation ◽  
Vapor Liquid

The fluorescence lifetime of N,N,N′,N′-tetramethyl- p-phenyIenediamine (TMPD) in the vapor phase has been determined to be 3.2 ± 0.3 ns for excitation at 337 nm. The rate constants for quenching of electronically excited TMPD by ground-state TMPD, O2, and CO2 have been determined to be <1 × 10−10 cm3/s, (9.9 ± 1.0) × 10−10 cm3/s, and <4 × 10−13 cm3/s, respectively. The rate for TMPD implies that self-quenching is negligible up to pressures of at least 10 Torr. The quenching rate by oxygen is sufficiently high to ensure that use of TMPD as a quantitative marker for fuel evaporation in exciplex-based vapor/liquid visualization systems is probably not possible if significant quantities of oxygen—as would be the case in combustion environments—are present.

Measurement of the Natural Lifetimes and Quenching Rate Constants of OH(2Σ+, v = 0,1) and OD(2Σ+, v = 0,1) Radicals

1973 ◽  
Vol 28 (2) ◽  
pp. 249-256 ◽  
Author(s):  
K. H. Becker ◽  
D. Haaks
Keyword(s):  
Rate Constants ◽  
Fluorescence Decay ◽  
Quenching Rate ◽  
Pulse Photolysis ◽  
Electronic Interactions ◽  
Electronically Excited ◽  
Vacuum Uv

The lifetimes of OH(2Σ+) and OD(2Σ+) radicals were measured by using pulse-photolysis of water and methanol in the vacuum-uv for the production of the electronically excited radicals. From the fluorescence decay measurements the natural lifetimes, as well as the quenching rate constants for several added gases such as H2O, CH3OH, H2, N2, Ar, and He were determined. In particular, the natural lifetime of OH (2Σ+, v = 0), τ = (1.00 ± 0.06) · 10-6 s, was corrected for rotation-vibration as well as for rotation-electronic interactions resulting in a lifetime of (0.83 ± 0.08) · 10-6 s for the rotationless state. A lifetime of (0.82 ± 0.08) · 10-6 s was derived for the rotationless state of OD(2Σ+,v = 0).

scholarly journals Electronic kinetics of molecular nitrogen and molecular oxygen in high-latitude lower thermosphere and mesosphere

2010 ◽  
Vol 28 (1) ◽  
pp. 181-192 ◽  
Author(s):  
A. S. Kirillov
Keyword(s):  
Molecular Oxygen ◽  
High Latitude ◽  
Molecular Nitrogen ◽  
Lower Thermosphere ◽  
Rate Coefficients ◽  
Triplet States ◽  
Quenching Rate ◽  
Principal Mechanism ◽  
Auroral Electron ◽  
Electronically Excited

Abstract. Total quenching rate coefficients of Herzberg states of molecular oxygen and three triplet states of molecular nitrogen in the collisions with O2 and N2 molecules are calculated on the basis of quantum-chemical approximations. The calculated rate coefficients of electronic quenching of O2* and N2* molecules show a good agreement with available experimental data. An influence of collisional processes on vibrational populations of electronically excited N2 and O2 molecules is studied for the altitudes of high-latitude lower thermosphere and mesosphere during auroral electron precipitation. It is indicated that molecular collisions of metastable nitrogen N2(A3Σu*) with O2 molecules are principal mechanism in electronic excitation of both Herzberg states c1Σu&amp;minus, A'3Δu, A3Σu+ and high vibrational levels of singlet states a1Δg and b1Σg+ of molecular oxygen O2 at these altitudes.

Quenching rate constants for reactions of Ar(4p′[1/2]0, 4p[1/2]0, 4p[3/2]2, and 4p[5/2]2) atoms with 22 reagent gases

2001 ◽  
Vol 115 (7) ◽  
pp. 3144-3154 ◽  
Author(s):  
N. Sadeghi ◽  
D. W. Setser ◽  
A. Francis ◽  
U. Czarnetzki ◽  
H. F. Döbele
Keyword(s):  
Rate Constants ◽  
Quenching Rate
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