Ultrafast Photoionization Induced Proton Transfer Dynamic in Phenol-Amide Cation Complex
碩士 === 國立清華大學 === 化學系 === 105 === We report studies of ultrafast proton transfer (PT) reaction of phenol-N-methylformamide(PhOH-NMF) and phenol-N,N-dimethylformamide (PhOH-DMF) cation complexes by using femtosecond pump-probe photoionization-photofragmentation spectroscopy (fs-PIPF). Neutral PhOH...
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ndltd-TW-105NTHU50650172019-05-15T23:10:12Z http://ndltd.ncl.edu.tw/handle/yq3yud Ultrafast Photoionization Induced Proton Transfer Dynamic in Phenol-Amide Cation Complex 超快光游離誘發酚-醯胺錯合物陽離子內之質子轉移動態學研究 Wu,Jun-Yi 吳俊毅 碩士 國立清華大學 化學系 105 We report studies of ultrafast proton transfer (PT) reaction of phenol-N-methylformamide(PhOH-NMF) and phenol-N,N-dimethylformamide (PhOH-DMF) cation complexes by using femtosecond pump-probe photoionization-photofragmentation spectroscopy (fs-PIPF). Neutral PhOH-NMF and PhOH-DMF complexes prepared in a free jet are photoionized by femtosecond [1+1] resonance-enhanced multiphoton ionization via S1 state, and the subsequent dynamics occurring in the cations is probed by delayed pulses that result in ion fragmentation. The observed probe-wavelength dependence of the transients are consistent with a spectral evolution from the initial non-PT to final PT states. The combination of experimental results and DFT calculations suggest that a low barrier is present along [PhOH-NMF]+ cation proton transfer reaction coordinate. There are three distinct time scales in [PhOH-NMF]+ experiments : τ_1≈0.23 ps is assigned to an initial wave-packet motion, τ_2=3 ps~18 ps is assigned to the proton transfer, and τ_3=40ps~81 ps is attributed to to complex isomerization. The experiments revealed that PT in [PhOH-DMF]+ cation also proceeds in three distinct steps: τ_1≈0.3 ps an initial wave-packet motion, followed by a slower relaxation τ_2≈2 ps and a final step τ_3=15ps~17 ps of complex isomerization. Cheng,Po-Yuan 鄭博元 2016 學位論文 ; thesis 116 zh-TW |
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碩士 === 國立清華大學 === 化學系 === 105 === We report studies of ultrafast proton transfer (PT) reaction of phenol-N-methylformamide(PhOH-NMF) and phenol-N,N-dimethylformamide (PhOH-DMF) cation complexes by using femtosecond pump-probe photoionization-photofragmentation spectroscopy (fs-PIPF). Neutral PhOH-NMF and PhOH-DMF complexes prepared in a free jet are photoionized by femtosecond [1+1] resonance-enhanced multiphoton ionization via S1 state, and the subsequent dynamics occurring in the cations is probed by delayed pulses that result in ion fragmentation. The observed probe-wavelength dependence of the transients are consistent with a spectral evolution from the initial non-PT to final PT states. The combination of experimental results and DFT calculations suggest that a low barrier is present along [PhOH-NMF]+ cation proton transfer reaction coordinate. There are three distinct time scales in [PhOH-NMF]+ experiments : τ_1≈0.23 ps is assigned to an initial wave-packet motion, τ_2=3 ps~18 ps is assigned to the proton transfer, and τ_3=40ps~81 ps is attributed to to complex isomerization. The experiments revealed that PT in [PhOH-DMF]+ cation also proceeds in three distinct steps: τ_1≈0.3 ps an initial wave-packet motion, followed by a slower relaxation τ_2≈2 ps and a final step τ_3=15ps~17 ps of complex isomerization.
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author2 |
Cheng,Po-Yuan |
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Cheng,Po-Yuan Wu,Jun-Yi 吳俊毅 |
author |
Wu,Jun-Yi 吳俊毅 |
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Wu,Jun-Yi 吳俊毅 Ultrafast Photoionization Induced Proton Transfer Dynamic in Phenol-Amide Cation Complex |
author_sort |
Wu,Jun-Yi |
title |
Ultrafast Photoionization Induced Proton Transfer Dynamic in Phenol-Amide Cation Complex |
title_short |
Ultrafast Photoionization Induced Proton Transfer Dynamic in Phenol-Amide Cation Complex |
title_full |
Ultrafast Photoionization Induced Proton Transfer Dynamic in Phenol-Amide Cation Complex |
title_fullStr |
Ultrafast Photoionization Induced Proton Transfer Dynamic in Phenol-Amide Cation Complex |
title_full_unstemmed |
Ultrafast Photoionization Induced Proton Transfer Dynamic in Phenol-Amide Cation Complex |
title_sort |
ultrafast photoionization induced proton transfer dynamic in phenol-amide cation complex |
publishDate |
2016 |
url |
http://ndltd.ncl.edu.tw/handle/yq3yud |
work_keys_str_mv |
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