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Interaction of light with matter has always been important in the field of natural science. Particularly, the ultrafast radiationless relaxation induced by UV light of molecular electronic excited states accompanied by ultrafast energy transfer plays an important role in the natural photophysical, photochemical and biological reactions. Generally, the molecular electronic excited state can be deactivated through a variety of decay channels, including dissociation, isomerization, internal conversion, intersysterm crossing, vibrational energy redistribution, and autoionization. This complexity of relaxation channels brings about a wide variety of deactivation mechanisms. The ultrafast nonadibatic relaxation dynamics of the excited state of phenylacetylene is studied by using femtosecond time-resolved photoelectron imaging and femtosecond time-resolved mass spectrometry. The first excited state S2 of phenylacetylene is excited by 235 nm pump light, and the excited state deactivation process is detected by 400 nm probe light. The time-dependent curves of parent ions include two exponential curves. One is the fast component with a time constant of 116 fs, and the other is the slow component with a time constant of 106 ps. The time-resolved photoelectron kinetic energy distribution is obtained from the time-resolved photoelectron images. Combined with the time-resolved photoelectron spectroscopy data, the fast component with a time constant of 116 fs is found to reflect the internal conversion process from S2 state to S1 state. The experimental results also show that S1 state is arranged by internal conversion, and the inter system jump process to T1 state is an important attenuation channel. This work provides a clearer physical picture for S1 state nonadibatic relaxation dynamics of phenylacetylene.
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Keywords:
- phenylacetylene /
- photoelectron imaging /
- intersystem crossing /
- time-resolved spectroscopy
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图 1 235 nm泵浦、400 nm探测条件下获得的母体离子时间衰减曲线, 圆圈代表实验结果, 实线代表拟合结果
Figure 1. Time-resolved total ion signals of parent ion as a function of delay time between the pump pulse at 235 nm and the probe pulse at 400 nm. The circles are the experimental results, and solid lines are the fitting results.
图 2 从Δt = 0 fs和Δt = 163 fs的影像中提取得到的光电子动能分布, 位于D0处的箭头表示(1+2')电离机制下最大的可资用能
Figure 2. Photoelectron kinetic energy distributions at Δt = 0 ps and Δt = 92 ps. The arrow at D0 indicates the maximum electron energy by two-photon absorption of probe beam at 400 nm after one-photon excitation of pump at 235 nm.
图 3 长时间延迟的235 nm泵浦、400 nm探测条件下获得的母体离子时间衰减曲线, 圆圈代表实验结果, 实线代表拟合结果
Figure 3. Time-resolved total ion signals of parent ion as a function of delay time between the pump pulse at 235 nm and the probe pulse at 400 nm. The circles are the experimental results, and solid lines are the fitting results.
图 4 在235 nm泵浦、400 nm探测不同泵浦-探测延迟下的光电子能谱
Figure 4. Photoelectron kinetic energy distributions (PKE) at different time delay observed at 235 nm pump and 400 nm probe.
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[1] Gruijl F R D 1999 Eur. J. Cancer. 35 2003
Google Scholar
[2] Ichihashi M, Ueda M, Budiyanto A, Bito T, Oka M, Fukunaga M, Tsuru K, Horikawa T 2003 Toxicology 189 21
Google Scholar
[3] Iqbal A, Stavros V G 2010 J. Phys. Chem. Lett. 1 227 4
Google Scholar
[4] Satzger H, Townsend D, Zgierski M Z, Patchkovskii S, Ullrich S, Stolow A 2006 P. Nati. Acad. Sci. 103 10196
Google Scholar
[5] Middleton C T, Harpe K D L, Su C, Law Y K, Carlos E C H, Kohler B 2009 Annu. Rev. Phys. Chem. 60 217
Google Scholar
[6] Zewail A H 2000 Angew. Chem. 39 2586
Google Scholar
[7] Schoenlein R W, Peteanu L A, Mathies R A, Shank C V 1991 Sci. 254 412
Google Scholar
[8] Gustavsson T, Improta R, Markovitsi D 2010 J. Phys. Chem. Lett 1 2453
Google Scholar
[9] Riedle E, Neusser H J, Schlag E W 1982 J. Phys. Chem. 86 4847
Google Scholar
[10] Otis C E, Knee J L, Johnson P M 1983 J. Phys. Chem. 87 2232
Google Scholar
[11] Toshinori S 2014 Bull. Chem. Soc. Jpn. 87 341
Google Scholar
[12] 蒿巧利 2017 博士学位论文 (武汉: 中国科学院武汉物理与数学研究所)
Hao Q L 2007 Ph. D. Dissertation (Wuhan: Institude of Physics and Mathematics, Chinese Academy of Sciences) (in Chinese)
[13] Farmanara P, Stert V, Radloff W, Hertel I V 2001 J. Phys. Chem. A 105 5613
Google Scholar
[14] Suzuki Y I, Horio T, Fuji T, Suzuki T 2011 J. Chem. Phys. 134 184313
Google Scholar
[15] Lee S H, Tang K C, Chen I C, et al. 2002 J. Phys. Chem. A 106 8979
Google Scholar
[16] Meisl M, Janoschek R 1986 J. Chem. Soc., Chem. Commun. 14 1066
Google Scholar
[17] Palmer I J, Ragazos I N, Bernardi F, Olivucci M, Robb M A 1993 J. Am. Chem. Soc. 115 673
Google Scholar
[18] Liu Y Z, Tang B F, Shen H, Zhang S, Zhang B 2010 Opt. Express. 18 5791
Google Scholar
[19] Wu G R, Hockett P, Stolow A 2011 Phys. Chem. Chem. Phys. 13 18447
Google Scholar
[20] 刘玉柱, Gerber Thomas, Knopp Gregor 2014 物理学报 63 244208
Google Scholar
Liu Y Z, Thomas G, Gregor K 2014 Acta Phys. Sin. 63 244208
Google Scholar
[21] Suzuki T 2006 Annu. Rev. Phys. Chem. 57 555
Google Scholar
[22] 布玛丽亚·阿布力米提, 凌丰姿, 邓绪兰, 魏洁, 宋辛黎, 向梅, 张冰 2020 物理学报 69 103301
Google Scholar
Abulimiti B, Ling F Z, Deng X L, Wei J, Song X L, Xiang M, Zhang B 2020 Acta Phys. Sin. 69 103301
Google Scholar
[23] Yan Y H, Long J Y, Liu Y Z 2020 Chem. Phys. 530 110611
Google Scholar
[24] 龙金友 2012博士学位论文(武汉: 中国科学院武汉物理与数学研究所)
Long J Y 2012 Ph. D. Dissertation (Wuhan: Institude of Physics and Mathematics, Chinese Academy of Sciences) (in Chinese)
[25] Leopold D G, Hemley R J, Vaida V 1981 J. Chem. Phys. 75 4758
Google Scholar
[26] Dribinski V, Ossadtchi A, Mandelshtam V A, Reisler H 2002 Rev. Sci. Instrum. 73 2634
Google Scholar
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