Infrared multiphoton excitation, dissociation and ionization of C60

Hippler, Michael; Qüack, Martin; Schwarz, R.; Seyfang, Georg; Matt, S.; Märk, T.D.

doi:10.1016/s0009-2614(97)00861-0

Cited by 37 publications

(26 citation statements)

References 31 publications

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“…This point is important, as it is frequently stated that only the first few IR photons in a molecule are absorbed resonantly and subsequent excitation can be performed at any wavelength. Here we will show that, at least for C 60 , this is not the case and even superhot C 60 does not absorb where, for example, a CO 2 laser emits, near 10 m. 10 …”

Section: Introductionmentioning

confidence: 70%

“…6 Those are all impulsive events that occur on the subpicosecond time scale. The optical excitation is usually induced via UV/visible ͑VIS͒ multiphoton absorption where the time scale for the energy deposition is dictated by the laser pulse duration and extends from the femtosecond 7 to the nanoseccond [8][9][10] range. Under some experimental conditions, the delayed emission of electrons after electronic excitation using UV/VIS lasers can be observed.…”

Section: Introductionmentioning

confidence: 99%

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Infrared multiphoton ionization of superhot C60: Experiment and model calculations

Bekkerman

Kolodney

Helden

et al. 2006

The Journal of Chemical Physics

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We address, both experimentally and theoretically, the issue of infrared ͑IR͒ resonance enhanced multiphoton ionization ͑IR-REMPI͒ and thermally induced redshifts of IR absorption lines in a very large and highly vibrationally excited molecular system. Isolated superhot C 60 molecules with well defined and variable average vibrational energy in the range of 9 -19 eV, effusing out of a constant flux thermal source, are excited and ionized after the absorption of multiple ͑500-800͒ infrared photons in the 450-1800 cm −1 spectral energy range. Recording the mass-selected ion signal as a function of IR wavelength gives well resolved IR-REMPI spectra, with zero off-resonance background signal. An enhancement of the ion signal of about a factor of 10 is observed when the temperature is increased from 1200 to 1800 K under otherwise identical conditions. A pronounced temperature dependent redshift of some of the IR absorption lines is observed. The observations are found to be in good agreement with a model which is based on the sequential absorption of single photons, always followed by instantaneous vibrational energy redistribution. The mass spectra ͑C 60 + fragmentation pattern͒ are found to be strongly excitation wavelength dependent. Extensive fragmentation down to C 32 + is observed following the absorption of 1350-1400 cm −1 as well as 1500-1530 cm −1 photons while negligible fragmentation is observed when exciting around 520 cm −1 .

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Infrared multiphoton ionization of superhot C60: Experiment and model calculations

Bekkerman

Kolodney

Helden

et al. 2006

The Journal of Chemical Physics

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“…Detection of superheated neutral C 60 via delayed ionization becomes very efficient once the internal energy reaches 35 -40 eV [1]. Recently, it has been reported that IR multiphoton excitation of C 60 with an intense pulsed CO 2 laser, leading to ionization and fragmentation, can indeed be observed [6]. Weak off-resonant absorption of IR photons is presumably responsible for the efficient transfer of energy into the molecule in this case [6].…”

Section: Infrared Resonance Enhanced Multiphoton Ionization Of Fullermentioning

confidence: 98%

“…Recently, it has been reported that IR multiphoton excitation of C 60 with an intense pulsed CO 2 laser, leading to ionization and fragmentation, can indeed be observed [6]. Weak off-resonant absorption of IR photons is presumably responsible for the efficient transfer of energy into the molecule in this case [6]. At higher fluences, multiphoton ionization with intense pulsed IR lasers is universally possible for atoms and molecules once the electric field of the laser is sufficiently high to pull an electron away from the ionic core.…”

Section: Infrared Resonance Enhanced Multiphoton Ionization Of Fullermentioning

confidence: 99%

Infrared Resonance Enhanced Multiphoton Ionization of Fullerenes

et al. 1997

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“…Mostly, IR-MPE leads to dissociation. There is, however, also an early 20 and a more recent 19 report where CO 2 laser IR excitation leads to the ionization of molecules. It is clear that the advantage of such a scheme is the potential for sensitive and mass selective detection.…”

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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Infrared multiphoton excitation, dissociation and ionization of C60

Cited by 37 publications

References 31 publications

Infrared multiphoton ionization of superhot C60: Experiment and model calculations

Infrared multiphoton ionization of superhot C60: Experiment and model calculations

Infrared Resonance Enhanced Multiphoton Ionization of Fullerenes

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

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