2024-03-29T11:48:29Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/837332022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Real-Time Probing of an Atmospheric Photochemical Reaction by Ultrashort Extreme Ultraviolet Pulses: Nitrous Acid Release from o-NitrophenolNitta, YukiSchalk, OliverIgarashi, HironoriWada, SatoiTsutsumi, TakuroSaita, KenichiroTaketsugu, TetsuyaSekikawa, Taro428Photolysis of o-nitrophenol, contained in brown carbon, is considered to be a major process for the generation of nitrous acid (HONO) in the atmosphere. In this Letter, we used time-resolved photoelectron spectroscopy with 29.5 eV probe pulses and ab initio calculations to disentangle all reaction steps from the excitation to the dissociation of HONO. After excitation, intersystem crossing to the triplet manifold follows ultrafast excited-state intramolecular hydrogen transfer, where the molecules deplanarizes and finally splits off HONO after 0.5-1 ps.American Chemical SocietyJournal Articleapplication/pdfhttp://hdl.handle.net/2115/83733https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/83733/1/JPCLett2_submitted_R2.pdf1948-7185Journal of physical chemistry letters1216746792021-01-04enginfo:doi/10.1021/acs.jpclett.0c03297This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of physical chemistry letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/articlesonrequest/AOR-XSMSHYV6FN5FB7CSICJR.author