Femtosecond time-resolved photoelectron spectra of ammonia molecules and clusters

Stert, V.; Radloff, W.; Freudenberg, Th.; Noack, F.; Hertel, I. V.; Jouvet, Christophe; Dedonder‐Lardeux, C.; Solgadi, D.

doi:10.1209/epl/i1997-00497-y

Cited by 24 publications

(17 citation statements)

References 18 publications

(13 reference statements)

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“…Photoionization always produces two species available for analysis-the ion and the electron. The extension of the photoelectron-photoion-coincidence (PEPICO) technique to the femtosecond time-resolved domain has been demonstrated and shown to be useful for studies of dynamics in clusters (43). Time and angle-resolved PEPICO measurements yielding ion-electron kinetic energy and angular correlations will shed new light on photodissociation dynamics in polyatomic molecules.…”

Section: Figurementioning

confidence: 99%

Femtosecond Time-Resolved Photoelectron Spectroscopy of Polyatomic Molecules

Stolow

2003

Annu. Rev. Phys. Chem.

261

193

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Femtosecond time-resolved photoelectron spectroscopy is emerging as a useful technique for investigating excited state dynamics in isolated polyatomic molecules. The sensitivity of photoelectron spectroscopy to both electronic configurations and vibrational dynamics makes it well suited to the study of ultrafast nonadiabatic processes. We review the conceptual interpretation of wavepacket dynamics experiments, emphasizing the role of the final state. We discuss the advantages of the molecular ionization continuum as the final state in polyatomic wavepacket experiments and show how the electronic structure of the continuum can be used to disentangle electronic from vibrational dynamics. We illustrate these methods with examples from diatomic wavepacket dynamics, internal conversion in polyenes and polyaromatic hydrocarbons, excited state intramolecular proton transfer, and azobenzene photoiosomerization dynamics.

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Section: Figurementioning

confidence: 99%

Femtosecond Time-Resolved Photoelectron Spectroscopy of Polyatomic Molecules

Stolow

2003

Annu. Rev. Phys. Chem.

261

193

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“…Such an unexpected fast electron relaxation in Pt 2 3 suggests the existence of inelastic electron-electron scattering processes in a triatomic cluster which result in a lifetime similar to those of bulk metals. Time-resolved photoelectron spectroscopy on small clusters has recently demonstrated wave packet evolution [1], intramolecular rearrangement [2], and fragmentation dynamics [3,4]. These processes are all related to nuclear motion which can be followed if the excited state is long lived with respect to the vibrational period.…”

Section: Ultrafast Hot-electron Dynamics Observed In Ptmentioning

confidence: 99%

Ultrafast Hot-Electron Dynamics Observed inPt3−Using Time-Resolved Photoelectron Spectroscopy

Pontius

Neeb

et al. 2000

Phys. Rev. Lett.

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Time-resolved two-photon photoelectron spectra have been measured for free Pt( -)(3) using femtosecond pulses of 1.5 eV photon energy in a pump-probe configuration. The time-dependent photoelectron distribution reveals a lifetime of optically excited states of less than 70 fs. Such an unexpected fast electron relaxation in Pt( -)(3) suggests the existence of inelastic electron-electron scattering processes in a triatomic cluster which result in a lifetime similar to those of bulk metals.

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“…Whereas this condition is satisfied and leads to appreciable acquisition statistics using SR, the count rates must be kept rather low when one turns to a kHz source. For a detailed discussion we refer to previous studies [36][37][38] and a forthcoming paper [39] and we illustrate below the conditions for the present report. Figure 4 displays a section of the time of flight (TOF) spectrum of the Xe + ions produced by 4-photon ionization of Xe using 398 nm-70 fs photons delivered by the femtosecond laser source PLFA (SLIC Saclay) obtained using the CIEL 2 ultrahigh vacuum supersonic expansion.…”

Section: Multiphoton Photoionization Of Xe Induced By Femtosecond Lasmentioning

confidence: 99%

Electron-ion vector correlations for the study of photoionization of molecules in the UVX range: From synchrotron radiation to short light pulses

Elkharrat

Picard

Billaud

et al. 2009

UVX 2008 - 9e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X : Applications Et Développements Récents

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Abstract. Molecular frame photoemission is a very sensitive probe of the photoionization (PI) dynamics of molecules. The electron-ion vector correlation (VC) method takes advantage of dissociative photoionization (DPI) reactions of small molecules to measure such observables. It relies on the coincident detection of the photoelectron and the ion fragment emitted from the same DPI event and the determination of their velocity vectors. Most of the VC studies so far have been performed using synchrotron radiation (SR) light sources which benefit from a high repetition rate (1-10 MHz) favorable for coincidence experiments. In this paper we discuss the extension of this method to the study of PI processes induced by ultra-short VUV light sources, which provide the capability for investigating processes characterized by femtosecond or subfemtosecond dynamics. We first illustrate the VC method by the report of recent results of a comparative study of resonant photoionization of the H 2 and D 2 molecules induced by VUV circularly polarized synchrotron radiation at SOLEIL in the region involving resonant excitation of Q 1 and Q 2 doubly excited state series. This problem is of particular interest since autoionization and dissociation of selected Q 1 or Q 2 states occur on a comparable time scale of few femtoseconds, which implies a coupling between the electronic and nuclear motion. The extension of the VC method using femtosecond laser sources is then demonstrated by results for multiphoton PI of the Xe atom induced by 70 fs pulses centered at 400 nm delivered by the SOFOCKLE and PLFA sources (SLIC, CEA-Saclay) after frequency doubling of a 1 kHz Ti:sapphire laser.

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Femtosecond time-resolved photoelectron spectra of ammonia molecules and clusters

Cited by 24 publications

References 18 publications

Femtosecond Time-Resolved Photoelectron Spectroscopy of Polyatomic Molecules

Femtosecond Time-Resolved Photoelectron Spectroscopy of Polyatomic Molecules

Ultrafast Hot-Electron Dynamics Observed inPt3−Using Time-Resolved Photoelectron Spectroscopy

Electron-ion vector correlations for the study of photoionization of molecules in the UVX range: From synchrotron radiation to short light pulses

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