Yu-Shu Lin, Cheng-Chung Chen, and Bor-Chen Chang Department of Chemistry National Central University Chung-Li 32001, Taiwan ~ ~ Electronic Spectroscopy.

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Presentation transcript:

Yu-Shu Lin, Cheng-Chung Chen, and Bor-Chen Chang Department of Chemistry National Central University Chung-Li 32001, Taiwan ~ ~ Electronic Spectroscopy of the GeCl 2 A-X Transition

MX 2 (M= C, Ge, X= Cl, Br) X1A1X1A1 ~ C X X C X X C X X Ge X X X X X X A1B1A1B1 ~ a3B1a3B1 ~ Ultraviolet Wavelengths Visible Wavelengths

Karolczak et al., J. Chem. Phys. 98, 60 (1993). LIF Excitation Spectrum of GeCl 2 Congested Band? Mok et al., ChemPhysChem 6, 719 (2005). Assignments of Hot Bands?

Dye Laser Nd:YAG Laser HV Power Supply Circuit Valve Controller Delay Generator Experimental Setup PMT LIF Excitation Monochromator ICCD Dispersed Fluorescence SHG ICCD Controller GeCl 4 /He Delay Generator

LIF Excitation Spectrum of the GeCl 2 A-X Transition ~

Peak Spacings ≈ 160 cm -1 FWHM= 23 cm -1 FWHM= 16 cm -1

Dispersed Fluorescence Spectra of Pumping Various Bands

GeCl 2 70 Ge 21.23% 72 Ge 27.66% 73 Ge 7.73% 74 Ge 35.94% 76 Ge 7.44% 35 Cl 75.77% 37 Cl 24.23%Isotopes GeCl 2 has 15 isotopomers! The major observed progression is emission to the ground state bending vibrational levels. Cl isotope structure is possibly resolvable. Bending frequency: Ge 35 Cl 2 > Ge 35 Cl 37 Cl > Ge 37 Cl 2

Vibrational Parameters (cm -1 ) for the GeCl 2 X State a ~ a One standard deviation in parentheses. b Karolczak et al., J. Chem. Phys. 98, 60 (1993). c Mok et al., ChemPhysChem 6, 719 (2005). d Miller et al., J. Mol. Struct. 77, 65 (1981). Ge 35 Cl 2 Ge 35 Cl 37 Cl Ge 37 Cl 2 LIF b Theoretical c 409.0(8) 391.2(7) b 409 c (5)158.19(10)154.36(3) 160.0(1) b 160 c 352(5) 372 d 389 c (1)-0.087(4) -0.7(6) b -0.78(3) No. of Levels

LIF Excitation Spectrum of the GeCl 2 A-X Transition ~

Blue Shift 160 cm -1 Pump at

Wavenumber (cm ) B C D A LIF Excitation Spectrum of the GeCl 2 A-X Transition ~

A B C D +: He Emission

Nature of The Congested Band GeCl: X X Discharge background Predissociation producing GeCl+Cl? Multiphoton Process? (GeCl 2 ) n van der Waals clusters?

+: He Emission

Summary Determined the detailed vibrational structure of the ground singlet electronic state. Clarified the hot band assignments. Provided more experimental data for unraveling the nature of the congested diffuse structure. J. Chem. Phys. 124, (2006).

AcknowledgmentsSupports: National Science Council, Taiwan National Central University Thank you for your attention ! Yu-Shu LinCheng-Chung Chen