CS{sub 2} decay dynamics investigated by two-color femtosecond laser pulses

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.042501· OSTI ID:20646353

Hongping, Liu ^[1]; Jianyang, Zhang; Shuhui, Yin; Li, Wang; Nanquan, Lou ^[1]

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1. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China)

The Rydberg-state decay dynamics of carbon disulfide (CS{sub 2}) has been investigated by (2+1{sup '}) resonance-enhanced multiphoton ionization with the pump-probe technique (pump wavelength 266 nm and probe wavelength 400 nm) on our homebuilt femtosecond laser system. The CS{sub 2} is pumped into Rydberg state 6s{sigma}{sub g} by two 266-nm photons, corresponding to the excitation energy 9.4 eV, and then ionized by temporally delayed 400-nm pulse. The CS{sub 2} ion yield dependence on the time delay determines the excited-state lifetime to be 409{+-}6 fs for C{sup 32}S{sup 32}S and 441{+-}7 fs for C{sup 32}S{sup 34}S, respectively, at 265 nm pump and the isotopically averaged lifetime 1034{+-}31 fs at 267.5 nm pump. The wavelength dependence of the lifetime may be due to the effect of electron spin on the potential energy surface--namely, separately subjected to two different mechanisms: internal conversion and intersystem crossing interaction.

• OSTI ID: 20646353
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CARBON SULFIDES
COLOR
DISULFIDES
ELECTRONS
EV RANGE
EXCITATION
FREQUENCY DEPENDENCE
INTERNAL CONVERSION
LASER RADIATION
LIFETIME
MOLECULAR IONS
OPTICAL PUMPING
PHOTOIONIZATION
PHOTON-MOLECULE COLLISIONS
PHOTONS
POTENTIAL ENERGY
PULSES
RESONANCE
RYDBERG STATES
SPIN
SURFACES
TIME RESOLUTION