IR spectroscopy of gas-phase C60−

Gas-Phase IR Spectroscopy of Nucleobases.

IR spectroscopy of nucleobases in the gas phase reflects simultaneous advances in both experimental and computational techniques. Important properties, such as excited state dynamics, depend in subtle ways on structure variations, which can be followed by their infrared signatures. Isomer specific spectroscopy is a particularly powerful tool for studying the effects of nucleobase tautomeric for...

Gas-phase IR spectroscopy of deprotonated amino acids.

Gas-phase infrared multiple photon dissociation (IRMPD) spectra have been recorded for the conjugate bases of a series of amino acids (Asp, Cys, Glu, Phe, Ser, Trp, Tyr). The spectra are dominated by strong symmetric and antisymmetric carboxylate stretching modes around 1300 and 1600 cm(-1), respectively. Comparison of the experimental spectra with spectra calculated at the DFT level suggests a...

Waveguide-enhanced 2D-IR spectroscopy in the gas phase.

A method for obtaining high-quality 2D-IR spectra of gas-phase samples is presented. Time-resolved IR absorption spectroscopy techniques, such as 2D-IR spectroscopy, often require that beams are focused into the sample. This limits the exploitable overlapped path length through samples to a few millimeters. To circumvent this limitation, 2D-IR experiments have been performed within a hollow wav...

IR photodissociation spectroscopy and theory of Au+(CO)n complexes: nonclassical carbonyls in the gas phase.

Au+(CO)n complexes are produced in the gas phase via pulsed laser vaporization, expanded in a supersonic jet, and detected with a reflectron time-of-flight mass spectrometer. Complexes up to n = 12 are observed, with mass channels corresponding to the n = 2 and n = 4 showing enhanced intensity. To investigate coordination and structure, individual complexes are mass-selected and probed with inf...

IR Photodissociation Spectroscopy and Theory of Au+(CO)n Complexes:â•› Nonclassical Carbonyls in the Gas Phase