Nonradiative Relaxation Processes and Electronically Excited States of Nitrobenzene Studied by Picosecond Time-Resolved Transient Grating Method

Takezaki, Makoto; Hirota, Noboru; Terazima, Masahide

doi:10.1021/jp963095t

Cited by 138 publications

(143 citation statements)

References 48 publications

Supporting

Mentioning

126

Contrasting

Order By: Relevance

“…Compared to the literature values, the obtained values of τ 1,solv in our study confirm the upper limit estimated by Takezaki et al in benzene (≤50 ps). 13 Subpicosecond time constants for ISC have been observed for a large number of nitrated polycyclic aromatic compounds. 67−69 In such systems, fast ISC was considered to be the key radiationless process facilitated by a very low energy gap between the first excited singlet and an upper triplet state analogously to the findings for o-NP in the present study.…”

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

“…Neither fluorescence nor phosphorescence has been reported to date for o-NP, which indicates ultrafast radiationless processes. Picosecond time-resolved transient absorption experiments of o-NP in benzene, conducted by Takezaki et al, 13 point to relaxation into the first excited triplet state, T 1 , after excitation in the UV. The underlying ISC process, however, remained unresolved due to limited time resolution and could only be estimated to occur on a time scale ≤50 ps.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrafast Dynamics of o-Nitrophenol: An Experimental and Theoretical Study

et al. 2015

View full text Add to dashboard Cite

Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1021/acs.jpca.5b04900Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Ultrafast dynamics of o-nitrophenol: An experimental and theoretical study Ernst, Hanna A.; Wolf, Thomas J. A.; Schalk, Oliver; González-García, Nuria; Boguslavskiy, Andrey E.; Stolow, Albert; Olzmann, Matthias; Unterreiner, Andreas-Neil http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/droits L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=ce83ef5b-a095-4e1f-85dd-e4e329f4a190 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=ce83ef5b-a095-4e1f-85dd-e4e329f4a190 ABSTRACT: The photolysis of o-nitrophenol (o-NP), a typical push−pull molecule, is of current interest in atmospheric chemistry as a possible source of nitrous acid (HONO). To characterize the largely unknown photolysis mechanism, the dynamics of the lowest lying excited singlet state (S 1 )o fo-NP was investigated by means of femtosecond transient absorption spectroscopy in solution, time-resolved photoelectron spectroscopy (TRPES) in the gas phase and quantum chemical calculations. Evidence of the unstable aci-nitro isomer is provided both in the liquid and in the gas phase. Our results indicate that the S 1 state displays strong charge transfer character, which triggers excited state proton transfer from the OH to the NO 2 group as evidenced by a temporal shift of 20 fs of the onset of the photoelectron spectrum. The proton transfer itself is found to be coupled to an out-ofplane rotation of the newly formed HONO group, finally leading to a conical intersection between S 1 and the ground state S 0 . In solution, return to S 0 within 0.2−0.3 ps was monitored by stimulated emission. As a competitive relaxation channel, ultrafast intersystem cro...

show abstract

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrafast Dynamics of o-Nitrophenol: An Experimental and Theoretical Study

et al. 2015

View full text Add to dashboard Cite

show abstract

“…An efficient chemical process is the excitation of various molecular species from the ground electronic state to the first (or higher) excited electronic state. This excitation has been shown experimentally [12] and theoretically [13] to be followed within picoseconds by a nonradiative transition back to the ground electronic state accompanied by excitation of that state's vibrational levels. The highly vibrational excited molecules undergo more frequent reactive collisions than those in lower vibrational states [14], thus increasing the chemical energy release rate and reducing the overall reaction zone length of the detonation wave [14] or lower pressure chemical processes [15].…”

Section: Chemical Reaction Ratesmentioning

confidence: 79%

Effect of electric fields on the reaction rates in shock initiating and detonating solid explosives

Tarver

2012

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. The presence of a strong electric field has been demonstrated to effect the shock initiation and detonation wave propagation of solid high explosives. Several mechanisms have been proposed to explain the observed increased shock sensitivity, increased detonation velocity, and decreased failure diameter of certain explosives. The most likely chemical mechanism is postulated to be the excitation of some of the explosive molecules and/or intermediate reaction products to higher energy electronic states, which rapidly transition nonradiatively to the ground electronic state with excited vibrational states. This vibrational excitation increases the reaction rates of the explosive decomposition chain reactions. The resulting shorter duration reaction zone causes faster shock to detonation transition, decreased failure thickness, and increased detonation velocity for a specific charge diameter.

show abstract

“…Since the relaxation time for nonradiative transition is about 10 À11 s, 65 it then can be neglected in our measurement. Although the system delay is di±cult to measure, it can maintain stably and keep constant in the same system.…”

Section: Discussionmentioning

confidence: 99%

Photoacoustic viscoelasticity imaging dedicated to mechanical characterization of biological tissues

Shi

Yang

Wang

2017

J. Innov. Opt. Health Sci.

View full text Add to dashboard Cite

Since changes in mechanical properties of biological tissues are often closely related to pathology, the viscoelastic properties are important physical parameters for medical diagnosis. A photoacoustic (PA) phase-resolved method for noninvasively characterizing the biological tissue viscoelasticity has been proposed by Gao et al. [G. Gao, S. Yang, D. Xing, \Viscoelasticity imaging of biological tissues with phase-resolved photoacoustic measurement," Opt. Lett. 36, 3341-3343 (2011)]. The mathematical relationship between the PA phase delay and the viscosity-elasticity ratio has been theoretically deduced. Moreover, systems of PA viscoelasticity (PAVE) imaging including PAVE microscopy and PAVE endoscopy were developed, and high-PA-phase contrast images re°ecting the tissue viscoelasticity information have been successfully achieved. The PAVE method has been developed in tumor detection, atherosclerosis characterization and related vascular endoscopy. We reviewed the development of the PAVE technique and its applications in biomedical¯elds. It is believed that PAVE imaging is of great potential in both biomedical applications and clinical studies.

show abstract

Nonradiative Relaxation Processes and Electronically Excited States of Nitrobenzene Studied by Picosecond Time-Resolved Transient Grating Method

Cited by 138 publications

References 48 publications

Ultrafast Dynamics of o-Nitrophenol: An Experimental and Theoretical Study

Ultrafast Dynamics of o-Nitrophenol: An Experimental and Theoretical Study

Effect of electric fields on the reaction rates in shock initiating and detonating solid explosives

Photoacoustic viscoelasticity imaging dedicated to mechanical characterization of biological tissues

Contact Info

Product

Resources

About