非表示:
キーワード:
MULTIPLE-PHOTON DISSOCIATION; DIRECT ABSORPTION-SPECTROSCOPY; AROMATIC-HYDROCARBON CATIONS; GAS-PHASE; MOLECULAR-IONS; CLUSTER IONS; PHOTODISSOCIATION SPECTROSCOPY; VIBRATIONAL SPECTROSCOPY; PROTONATED BENZENE; EMISSION BANDS
要旨:
A Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer has been installed at a free electron laser (FEL) facility to obtain infrared absorption spectra of gas phase ions by infrared multiple photon dissociation (IRMPD). The FEL provides continuously tunable infrared radiation over a broad range of the infrared spectrum, and the FT-ICR mass spectrometer, utilizing a 4.7 Tesla superconducting magnet, permits facile formation, isolation, trapping, and high-mass resolution detection of a wide range of ion classes. A description of the instrumentation and experimental parameters for these experiments is presented along with preliminary IRMPD spectra of the singly-charged chromium-bound dimer of diethyl ether (Cr(C4H10O)(2)(+)) and the fluorene molecular ion (C13H10+). Also presented is a brief comparison of the fluorene cation spectrum obtained by the FT-ICR-FEL with an earlier spectrum recorded using a quadrupole ion trap (QIT).