Long-range Interactions for the A31u and B30+u States of Cd2 from Line Shape Measurements

T. Grycuka, M. Michalickab and J. Rogaczewskic aInstitute of Experimental Physics, Warsaw University Hoża 69, 00-681 Warszawa, Poland bGrammar School No 3, Conrada 6, 01-922 Warszawa, Poland cInstitute of Physics, Warsaw University of Technology Koszykowa 75, 00-662 Warszawa, Poland

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Received: February 19, 2002

We report on very precise measurements of the absorption profile of the 326.1 nm resonance line of cadmium broadened by interactions with the ground state Cd atoms under thermal equilibrium. The experimental red wing profiles, corrected for the Boltzmann factor at different temperatures, are analysed in terms of the long-range potential parameters including dispersion and resonant interactions. The resonant interaction energy constant C3 is calculated to be 2.31x10-2 eVA3 and the van der Waals constant C6 for difference potentials between the ground state X10+g and the excited states B30+u and A31u of Cd2 derived experimentally are found to be (182.6±8) eVA6 and (289±4) eVA6, respectively. The former is determined for the first time and the latter is considerably corrected in comparison to earlier determination. The van der Waals constant C6 for the ground state of Cd2 is discussed and estimated to be C6g=(247±40) eVA6.

DOI: 10.12693/APhysPolA.101.825 PACS numbers: 33.70.-w, 34.20.-b, 32.70.-n