Ultrafast Vibrational Relaxation Dynamics in XUV-Excited Polycyclic Aromatic Hydrocarbon Molecules

Infrared spectra of protonated polycyclic aromatic hydrocarbon molecules: azulene.

The infrared (IR) spectrum of protonated azulene (AzuH(+), C(10)H(9)(+)) has been measured in the fingerprint range (600-1800 cm(-1)) by means of IR multiple photon dissociation (IRMPD) spectroscopy in a Fourier transform ion cyclotron resonance mass spectrometer equipped with an electrospray ionization source using a free electron laser. The potential energy surface of AzuH(+) has been charact...

Polycyclic aromatic hydrocarbon selected galaxies

Context. This is the fourth in a series of papers based on the ISOCAM Parallel Survey at 6.7 μm. While the first three papers have been devoted to active galactic nuclei (AGN), here we report on emission-line galaxies without AGN signatures in their optical spectra. Aims. Polycyclic aromatic hydrocarbon (PAH) emission has been found in both starbursts and modestly starforming galaxies, but the ...

Molecular dynamics simulation of vibrational energy relaxation of highly excited molecules in fluids. I. General considerations

Ultrafast relaxation dynamics of optically excited electrons in Ni

Photon-induced ultrafast energy dissipation in small isolated Ni3 2 has been studied by two-color pumpprobe photoelectron spectroscopy. The time-resolved photoelectron spectra clearly trace the path from a singleelectron excitation to a thermalized cluster via both inelastic electron-electron scattering and electronvibrational coupling. The relatively short electron-electron-scattering time of ...

XUV excitation followed by ultrafast non-adiabatic relaxation in PAH molecules as a femto-astrochemistry experiment

Highly excited molecular species are at play in the chemistry of interstellar media and are involved in the creation of radiation damage in a biological tissue. Recently developed ultrashort extreme ultraviolet light sources offer the high excitation energies and ultrafast time-resolution required for probing the dynamics of highly excited molecular states on femtosecond (fs) (1 fs=10(-15) s) a...