The Optical Spectrum of Atomic Clusters Si_3 and S_3

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Electronic (Uv/Vis/Nir)

Scientific paper

The optical spectra of the atomic clusters Si_3 and S_3 will be discussed in detail. The jet-cooled 2-colour resonant-2-photon ionisation spectrum of Si_3 has now been detected for the first time in the 530 nm region. For Si_3 a progression in the excited state bending and stretching modes are seen built onto the origin. Lower state frequencies derived from sequence band structure agree with those previously measured for the D3h low lying electronic state.
For thiozone additional experiments were undertaken and progressions in the excited state bending and stretching modes are seen with frequencies of 350 cm-1 and 420 cm-1 built onto the origin band at 23053.5 cm-1 respectively. In this talk our results are compared to theoretical results on both the C2v and D3h forms.

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