Journal
ANNUAL REVIEW OF PHYSICAL CHEMISTRY, VOL 63
Volume 63, Issue -, Pages 635-660Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-physchem-032511-143720
Keywords
femtochemistry; molecular ion chemistry; interstellar molecular clouds; reaction microscopes; molecular alignment; photoionization
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Free-electron lasers are fourth-generation light sources that deliver extremely intense (>10(12) photons per pulse), ultrashort (similar to 10(-14) s = 10 fs) light pulses at up to kilohertz repetition rates with unprecedented coherence properties and span a broad wavelength regime from soft (similar to 10 eV) to hard X-ray energies (similar to 15 keV). They thus enable a whole suite of novel experiments in molecular physics and chemistry: Inspecting radiation-induced reactions in cold molecular ions provides unprecedented insight into the photochemistry of interstellar clouds and upper planetary atmospheres; double core-hole photoelectron spectroscopy offers enhanced sensitivity for chemical analysis; the dynamics of highly excited molecular states, pumped by vacuum ultraviolet pulses, can be inspected; and vacuum ultraviolet or X-ray probe pulses generally hold the promise to trace chemical reactions along an entire reaction coordinate with atomic spatial and temporal resolution. This review intends to provide a first overview on upcoming possibilities, emerging technologies, pioneering results, and future perspectives in this exciting field.
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