Is Multiphoton Dissociation of Molecules a Statistical Thermal Process?

Grant, Edward R.; Schulz, P. A.; Sudbo, Aa. S.; Shen, Y. R.; Lee, Y. T.

doi:10.1103/physrevlett.40.115

Cited by 216 publications

(62 citation statements)

References 5 publications

(1 reference statement)

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“…30 The branching ratio determined from this experiment is much less than 1, -0.5, indicating an initial internal energy distribution closer to 1500 K than to 900 K.…”

mentioning

confidence: 99%

Methane Loss in the Infrared Multiphoton Dissociation of Acetic Acid

Longfellow¹,

Lee²

1995

J. Phys. Chem.

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“…30 The branching ratio determined from this experiment is much less than 1, -0.5, indicating an initial internal energy distribution closer to 1500 K than to 900 K.…”

mentioning

confidence: 99%

Methane Loss in the Infrared Multiphoton Dissociation of Acetic Acid

Longfellow¹,

Lee²

1995

J. Phys. Chem.

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“…[3][4][5][6][7][8]. Rather than measuring the direct absorption of infrared photons, detection is instead based on changes in the chemical composition of the sample, which, for example, can be diagnosed from its mass spectrum.…”

Section: Introductionmentioning

confidence: 99%

Infrared multiple photon dynamics and spectroscopy of cationic PABA and its dehydroxylated fragment ion

Moore

Meijer

Helden

2004

Phys. Chem. Chem. Phys.

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The gas-phase infrared spectra of cationic para-amino benzoic acid (PABA, H 2 N-C 6 H 4 -COOH) and its dehydroxylated fragment ion, the para-amino benzoyl (PABz, H 2 N-C 6 H 4 -CO) cation, are presented in the 500-2500 cm À1 range. The spectra are obtained via mass-selective infrared multiple photon dissociation (IRMPD) using a continuously tunable free electron laser. Although both spectra are in good overall agreement with results from density functional theory, some interesting discrepancies are also observed. Particularly in the spectrum of the PABz cation, the strongly anharmonic NH 2 out-of-plane bending mode causes substantial deviations from theory. The relative intensity of this out-of-plane bending mode in both the PABA and PABz cation spectra is much lower than calculated, similar to what has been reported for cationic aniline. For the PABz cation, two distinct fragmentation products are observed and recording the infrared spectra on these individual decay channels yields information on the dissociation mechanism. Moreover, it is experimentally shown that the decay rate into the two competing channels can qualitatively be described using statistical models.

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“…15 The mechanisms of IR-MPE and IR-MPD were also theoretically investigated. 13,[16][17][18][19] Models assume that the IR photons are absorbed resonantly by bright states. When the internal energy of the molecule increases, the density of vibrational states rises dramatically.…”

Section: Introductionmentioning

confidence: 99%

Resonant Ionization Using IR Light: A New Tool To Study the Spectroscopy and Dynamics of Gas-Phase Molecules and Clusters

2003

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Resonant IR excitation of gas-phase molecules and clusters can lead to superhot species that thermally emit an electron. Monitoring the mass selected ion yield as a function of IR laser frequency yields the IR-REMPI (infrared resonance enhanced multiphoton ionization) spectrum of the molecule or cluster. Although this IR-REMPI spectrum is not the same as the linear absorption spectrum, it can be quite similar and it yields valuable information on the IR optical properties of the species investigated. In this article, the method and the necessary tools are presented. Results from experiments on fullerenes, metal carbide, metal oxide, and metal nitride clusters are shown.

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Is Multiphoton Dissociation of Molecules a Statistical Thermal Process?

Cited by 216 publications

References 5 publications

Methane Loss in the Infrared Multiphoton Dissociation of Acetic Acid

Methane Loss in the Infrared Multiphoton Dissociation of Acetic Acid

Infrared multiple photon dynamics and spectroscopy of cationic PABA and its dehydroxylated fragment ion

Resonant Ionization Using IR Light: A New Tool To Study the Spectroscopy and Dynamics of Gas-Phase Molecules and Clusters

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