Chemistry with stretched molecules

Wodtke, Alec M.

doi:10.1016/s1464-1917(01)00033-2

Cited by 4 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The potential importance of vibrationally excited reagents in atmospheric reactions has started to receive some interest. 7,20 Although such reactions can be very efficient, concentrations of vibrationally excited reagents are typically very low, especially in the troposphere where collisional deactivation is rapid. However, if the reaction were to involve atmospheric O 2 (or N 2 ) as a reagent, it could compete very favourably with deactivation, enhancing the importance of this channel.…”

Section: B Reaction Of O 2 ( 3 R) + Hooh(v)mentioning

confidence: 99%

Bimolecular reaction of molecular oxygen with overtone excited HOOH: Implications for recycling HO2 in the atmosphere

Donaldson¹,

Francisco

2003

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Section: B Reaction Of O 2 ( 3 R) + Hooh(v)mentioning

confidence: 99%

Bimolecular reaction of molecular oxygen with overtone excited HOOH: Implications for recycling HO2 in the atmosphere

Donaldson¹,

Francisco

2003

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

“…An effective method for accelerating chemical reactions is excitation of vibrational or electronic degrees of freedom of reactive molecules. Experimental data show that molecules excited even to the lowest vibrational or electronic states react 10-100 times faster than unexcited ones [1][2][3][4]. The burning of the most combustible mixtures occurs through the mechanism of chain-branching reactions.…”

Section: Introductionmentioning

confidence: 99%

Initiation of combustion by laser-induced excitation of molecular vibrations of reactants

2006

View full text Add to dashboard Cite

The features of combustion initiation in H 2 /air and CH 4 (C 2 H 2 )/air mixtures under laser-induced excitation of the asymmetric mode of ozone molecules added in a small amount to the mixture are analyzed. It was shown that such an approach to supply radiation energy to the combustible mixtures reduces the induction time and decreases the ignition temperature at a small energy of laser radiation delivered to the mixture. These effects are explained mostly by two factors -the intensification of chain reactions due to acceleration of O-atom formation during dissociation of vibrationally excited O 3 molecules and the heating of the mixture due to a faster decomposition of O 3 molecules. The considered method of ignition/combustion control is much more effective (by a factor of 10-100) than the method based on heating the gas by resonance laser radiation in the case where the characteristic time of highly reactive radical and atom formation does not exceed significantly the relaxation time of the asymmetric mode of the O 3 molecule.

show abstract

“…The reactivity of vibrationally and electronically excited molecules is known to be tenfold and even hundredfold higher than that of non-excited molecules [4][5][6]. It was demonstrated previously that excitation of molecular vibrations or electronic states can reduce the ignition temperature, decrease the induction time, initiate a detonation wave in a supersonic flow at moderate distances from the discharge zone, and even increase the efficiency of conversion of chemical energy released during combustion to thermal energy [3,7,8].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of combustion of a hydrogen-air mixture by excitation of O2 molecules to the a 1Δ g state

Kozlov

Starik

Титова

2008

Combust Explos Shock Waves

View full text Add to dashboard Cite

The possibility of increasing the laminar flame velocity in a hydrogen-air mixture by excitation of O 2 molecules into the a 1 Δ g singlet state. The presence of 10% of O 2 (a 1 Δ g ) molecules in oxygen is demonstrated to result in noticeable (up to 50%) enhancement of mixture burning. The temperature of combustion products and also the concentrations of H 2 O, NO, and other constituents increase. The greatest effect of O 2 (a 1 Δ g ) molecules is manifested in combustion of lean mixtures; the least pronounced effect is observed in rich mixtures. These effects are caused by intensification of the chain mechanism in the presence of a super-equilibrium amount of excited O 2 (a 1 Δ g ) molecules in a hydrogen-air mixture.

show abstract

Chemistry with stretched molecules

Cited by 4 publications

References 46 publications

Bimolecular reaction of molecular oxygen with overtone excited HOOH: Implications for recycling HO2 in the atmosphere

Bimolecular reaction of molecular oxygen with overtone excited HOOH: Implications for recycling HO2 in the atmosphere

Initiation of combustion by laser-induced excitation of molecular vibrations of reactants

Enhancement of combustion of a hydrogen-air mixture by excitation of O2 molecules to the a 1Δ g state

Contact Info

Product

Resources

About