Formation and photodepletion of cluster ion–messenger atom complexes in a cold ion trap: Infrared spectroscopy of VO+, VO2+, and VO3+

Abstract

A novel experimental technique is described in which radiation from a free electron laser is used to measure infrared spectra of gas-phase cluster ions via vibrational predissociation of the corresponding ion–messenger atom complexes. The weakly bound complexes are formed in a temperature-controllable, radio frequency ion trap. This technique is applied to the study of the vibrational spectroscopy of the monovanadium oxide cluster cations VO+, VO2+, and VO3+.

Site-specific vibrational spectral signatures of water molecules in the magic H 3 O + (H 2 O) 20 and Cs + (H 2 O) 20 clusters

“…The continuous molecular beam was collimated using a He-filled RF-only octopole ion guide. After mass selection with a quadrupole mass filter, the ions were focused into a linear RF ring electrode ion-trap, which was kept at 13-14 K, to accumulate, thermalize, and D 2 messenger tag (37). Ion packets were extracted and focused in a 5-Hz cycle into the center of the extraction region of TOF mass spectrometer.…”

Structures and vibrational spectroscopy of partially reduced gas-phase cerium oxide clusters

“…Rare gas tagged complexes are stabilized through threebody collisions. 12 After filling the trap for 98 ms, all ions are extracted from the ion trap and focused both temporally and spatially into the center of the extraction region of an orthogonally mounted linear time-of-flight (TOF) mass spectrometer. Here, the ion packet can be irradiated with the IR laser pulse prior to the application of high voltage pulses on the acceleration electrodes and the subsequent measurement of the TOF mass spectrum.…”

“…Global structure optimizations of the clusters with compositions Ce 2 O 2 + , Ce 3 O 4 + , and (CeO 2 ) m CeO + (m = 0-4) have been made employing density functional theory (DFT). Since DFT calculations are of limited accuracy the final structure assignment is achieved by comparing the infrared (IR) absorption spectra, calculated for the lowest energy isomers, with measured IR vibrational predissociation 12 (IRVPD) spectra. Previously, this approach was applied to determine the structures of other metal oxide cluster cations, including vanadium, 13 [16][17][18][19][20][21][22][23][24][25][26][27][28][29] there are two novel aspects within our study.…”

Infrared spectroscopic characterization of the oxidative dehydrogenation of propane by V4O10+

“…Spectroscopic measurements, in combination with density functional calculations, have proven valuable to determine structures of anionic [19][20][21][22][23][24], neutral [25,26] and cationic [22,23,[27][28][29] vanadium oxide clusters, but have rarely been extended to metal oxide cluster -hydrocarbon complexes. Fielicke et al measured infrared photodissociation (IRPD) spectra of the association complex of V 2 O 5,6 + with ethylene formed in the expansion of the laser vaporization source [30].…”