منابع مشابه
Photodissociation dynamics of OCS near 214 nm using ion imaging.
The OCS photodissociation dynamics of the dominant S((1)D2) channel near 214 nm have been studied using velocity map ion imaging. We report a CO vibrational branching ratio of 0.79:0.21 for v = 0:v = 1, indicating substantially higher vibrational excitation than that observed at slightly longer wavelengths. The CO rotational distribution is bimodal for both v = 0 and v = 1, although the bimodal...
متن کامل157 nm photodissociation of dipeptide ions containing N-terminal arginine.
Twenty singly-charged dipeptide ions with N-terminal arginine were photodissociated using 157 nm light in both a linear ion-trap mass spectrometer and a MALDI-TOF-TOF mass spectrometer. Analogous to previous work on dipeptides containing C-terminal arginine, this set of samples enabled insights into the photofragmentation propensities associated with individual residues. In addition to familiar...
متن کاملSpeed-Dependent Photofragment Orientation in the Photodissociation of OCS at 223 nm
Carbonyl sulfide (OCS) was photolyzed with linearly polarized 223 nm light and the sulfur-atom photofragment S(D2) was probed by (2 + 1) resonance enhanced multiphoton ionization (REMPI) using alternatively left and right circularly polarized light. The measured orientation of the angular momentum was found to depend strongly on the speed of the sulfur atom photofragment: fast S atoms show a la...
متن کاملPhotodissociation dynamics of the thiophenoxy radical at 248, 193, and 157 nm.
The photodissociation dynamics of the thiophenoxy radical (C6H5S) have been investigated using fast beam coincidence translational spectroscopy. Thiophenoxy radicals were produced by photodetachment of the thiophenoxide anion followed by photodissociation at 248 nm (5.0 eV), 193 nm (6.4 eV), and 157 nm (7.9 eV). Experimental results indicate two major competing dissociation channels leading to ...
متن کاملFactors Affecting the Production of Aromatic Immonium Ions in MALDI 157 nm Photodissociation Studies.
Immonium ions are commonly observed in the high energy fragmentation of peptide ions. In a MALDI-TOF/TOF mass spectrometer, singly charged peptides photofragmented with 157 nm VUV light yield a copious abundance of immonium ions, especially those from aromatic residues. However, their intensities may vary from one peptide to another. In this work, the effect of varying amino acid position, pept...
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ژورنال
عنوان ژورنال: The Journal of Chemical Physics
سال: 1989
ISSN: 0021-9606,1089-7690
DOI: 10.1063/1.456443