Direct observation of photoionization dynamics in solution phase induced by femtosecond two-photon excitation

In solution phase, the solute can be photo-ionized in the lower excitation energy than its ionization potential in gas phase. Therefore, the specific interaction is expected to be exist between the surrounding media and higher excited (Sn) state of the solute. In order to elucidate such polarization effect of solvent on the photoionization process, femtosecond double-pulse excitation was applied to direct detection of low-energy photoionization dynamics of a phenylenediamine derivative in solution phase. From the results of the transient absorption change, in polar solvent, it is clearly indicated that photoionization does not proceed directly from the Sn state, but through specific intermediate state. Moreover,

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Slow photoionization via higher excited states of N,N-dimethylaniline in ethanol solution probed by femtosecond transient absorption spectroscopy under two-pulse two-photon excitation

The Journal of Chemical Physics ◽

10.1063/5.0028018 ◽

2021 ◽

Vol 154 (5) ◽

pp. 054304

Author(s):

Masafumi Koga ◽

Yuto Miyake ◽

Mizuki Hayasaka ◽

Hikaru Sotome ◽

Hiroshi Miyasaka

Keyword(s):

Excited States ◽

Absorption Spectroscopy ◽

Transient Absorption ◽

Ethanol Solution ◽

Transient Absorption Spectroscopy ◽

Two Photon ◽

Femtosecond Transient Absorption ◽

Photon Excitation ◽

Femtosecond Transient Absorption Spectroscopy ◽

Higher Excited States

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Sequential absorption processes in two-photon-excitation transient absorption spectroscopy in a semiconductor polymer

Physical Review B ◽

10.1103/physrevb.73.245201 ◽

2006 ◽

Vol 73 (24) ◽

Cited By ~ 12

Author(s):

Xinping Zhang ◽

Yajun Xia ◽

Richard H. Friend ◽

Carlos Silva

Keyword(s):

Absorption Spectroscopy ◽

Transient Absorption ◽

Transient Absorption Spectroscopy ◽

Two Photon ◽

Photon Excitation ◽

Sequential Absorption ◽

Two Photon Excitation

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Fs-transient Absorption and Fluorescence Upconversion after Two-Photon Excitation of Carotenoids in Solution and in LHC II

Ultrafast Phenomena ◽

10.1364/up.2000.tuf51 ◽

2000 ◽

Author(s):

P. J. Walla ◽

P. A. Linden ◽

G. R. Fleming

Keyword(s):

Transient Absorption ◽

Lhc Ii ◽

Two Photon ◽

Photon Excitation ◽

Fluorescence Upconversion ◽

Two Photon Excitation

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Resonance Two-Photon Ionization of Diarylethene in the Presence of Cyclodextrin

International Journal of Photoenergy ◽

10.1155/2013/374180 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6 ◽

Cited By ~ 4

Author(s):

Michihiro Hara ◽

Makoto Miwa ◽

Tatsuya Takeshita ◽

Shouhei Watanabe

Keyword(s):

Transient Absorption ◽

Flash Photolysis ◽

Laser Flash Photolysis ◽

Laser Flash ◽

Quantum Yields ◽

Two Photon ◽

Photon Excitation ◽

Simultaneous Irradiation ◽

Aqueous Solvent ◽

Photon Ionization

The transient absorption of the diarylethene 1,2-bis(2,4-dimethyl-5-phenyl-3-thienyl)-3,3,4,4,5,5-hexafluoro-1-cyclopentene (DE) was measured using 266 nm laser flash photolysis in the presence of various cyclodextrins (CDs) in aqueous solvent. Ionization of DE occurred within the laser flash (5 ns) to give the DE radical cation and water-solvated electron. The electron was generated by two-photon excitation through simultaneous irradiation with 266 nm laser light, and the ionization quantum yields of DE in the presence ofα-CD,β-CD, m-β-CD, andγ-CD depended on the properties of the DE/CD complexes. These results suggest that useful two-photon ionization occurred for these complexes. The ionization quantum yield of DE was found to increase in aqueous solution after the addition of m-β-CD (50 mM), in which m-β-CD likely controlled the photochromic reactivity of DE.

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