Direct mapping of curve-crossing dynamics in IBr by attosecond transient absorption spectroscopy
Abstract
As light pulses get shorter in time, they correspondingly get broader in frequency. Kobayashi et al. take advantage of both properties of attosecond pulses to elucidate iodine monobromide (IBr) photodissociation by detecting ultrafast bromine and iodine spectral shifts simultaneously. A preliminary burst of light weakens the I–Br bond. Then, as the atoms fly apart, they reach a configuration where the bond vibration can couple ground and excited electronic states. The broadband probe pulse reveals rapid changes in each atom's electronic structure at this juncture.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 05, 2019
- Source ID
- 10.1126/science.aax0076
Entities
People
- Daniel Neumark
- Kristina F Chang
- Stephen R. Leone
- Tao Zeng
- Yuki Kobayashi
Organizations
- Army Research Office
- Carleton University
- Lawrence Berkeley National Laboratory
- National Institutes of Health
- National Science Foundation
- Natural Sciences and Engineering Research Council
- Yusuf Hamied Department of Chemistry