Abstract
The absorption spectra of YBr and YI between 445 and 510 nm have been investigated using the technique of laser vaporization/reaction with free jet expansion and cavity ring down laser absorption spectroscopy. Seven vibronic transition bands of the D1Π–X1Σ+ system of YBr were recorded and studied. Spectra of both Y79Br and Y81Br isotopic molecules were observed and analysed, which yielded vibrational constants for the D1Π state. Eighteen vibronic transition bands of the D1Π – X1Σ+ system of YI have also been recorded and analysed, and accurate vibrational constants were obtained. A comparison of spectroscopic parameters of D1Π state of yttrium monohalides shows the strength of the halogen element as a ligand in splitting the d orbitals of the transition metal atom, Y.
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Acknowledgements
The work described here was supported by the National Natural Science Foundation of China (No. 21107026); the Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry and the Fundamental Research Funds for the Central Universities (No. 2009ZM0126) and a grant from the Research Grants Council of The Hong Kong Special Administrative Region, China (Project No.: HKU 7138/99P). We would also like to thank Professor Colin M. Western of University of Bristol for sending us a copy of the PGOPHER software and helping in using the program.