Excitation Energy-Dependent Decay Dynamics of the S₁ State of N-Methyl-2-pyridone

Feng, Baihui1,2,3; Yang, Dongyuan1; He, Zhigang1; Fang, Benjie2; Wu, Guorong1; Yang, Xueming1,4

2023-11-21

10.1021/acs.jpca.3c05745

JOURNAL OF PHYSICAL CHEMISTRY A   影响因子和分区

1089-5639

1520-5215

The UV-induced decay dynamics of N-methyl-2-pyridone is investigated using a femtosecond time-resolved photoelectron spectroscopy method. Irradiation in the wavelength range of 339.3-258.9 nm prepares N-methyl-2-pyridone molecules with very different vibrational levels of the S-1(1(1)pi pi*) state. For v ' = 0 (origin) and a few low-energy vibrational levels slightly above the S-1 state origin, the radiative decay channel is in operation for some specific vibrations. This is revealed by the excited-state lifetime of >> 1 ns. In addition, some other nearby S-1 vibronic states have a much shorter lifetime in the range of several picoseconds to a few tens of picoseconds, indicating that the radiation-less decay to the ground state (S-0) via internal conversion is the dominant channel for them. As the pump wavelength slightly decreases, the radiative decay is suddenly not important at all, and the deactivation rate of the S-1 state becomes faster. At shorter pump wavelengths, the lifetime of highly excited vibrational states of the S-1 state further decreases with the increase in the vibrational excess energy. This study provides quantitative information about the excitation energy-dependent decay dynamics of the S-1 state of N-methyl-2-pyridone. Methyl substitution effects on the excited-state dynamics of 2-pyridone are also discussed.

SCI ; EI

英语

其他

National Natural Science Foundation of China["21833003","22203095","22103087","22288201"] ; National Natural Science Foundation of China[GJJSTD20220001] ; Key Technology Team of the Chinese Academy of Sciences[XDB17000000]

Chemistry ; Physics

Chemistry, Physical ; Physics, Atomic, Molecular & Chemical

WOS:001116863300001

AMER CHEMICAL SOC

20234915181529

Dynamics ; Ground state ; Photoelectron spectroscopy ; Spectroscopic analysis

Chemistry:801 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

CHEMISTRY

2-s2.0-85179018523

Web of Science

1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Liaoning, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Key Lab Chem Lasers, Dalian 116023, Liaoning, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Southern Univ Sci & Technol, Coll Sci, Dept Chem, Shenzhen 518055, Peoples R China

Feng, Baihui,Yang, Dongyuan,He, Zhigang,et al. Excitation Energy-Dependent Decay Dynamics of the S₁ State of N-Methyl-2-pyridone[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2023,127(48):10139-10146.

Feng, Baihui,Yang, Dongyuan,He, Zhigang,Fang, Benjie,Wu, Guorong,&Yang, Xueming.(2023).Excitation Energy-Dependent Decay Dynamics of the S₁ State of N-Methyl-2-pyridone.JOURNAL OF PHYSICAL CHEMISTRY A,127(48),10139-10146.

Feng, Baihui,et al."Excitation Energy-Dependent Decay Dynamics of the S₁ State of N-Methyl-2-pyridone".JOURNAL OF PHYSICAL CHEMISTRY A 127.48(2023):10139-10146.