Optical–Optical Double Resonance Spectroscopy of theA–XandB–XSystems of Na3

✍ Scribed by David T. Vituccio; Oleg Golonzka; Wolfgang E. Ernst

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 445 KB
• Volume: 184
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1997.7272

✦ Synopsis

The X and A states of the sodium trimer may be treated as rigid asymmetric rotors of C 2£ symmetry. The B state, however, is a floppy molecule where the three sodium nuclei can perform a pseudorotational motion in the molecular plane. A recently developed model Hamiltonian for the B state is applied to new rotationally resolved optical-optical double resonance measurements of the B-X system of Na 3 . These recorded transitions, in the u Å 1, j Å 0, 1, 2, and 3 bands of that system, are fit to the new Hamiltonian and rotational assignments are made. The double resonance technique utilized one dye laser fixed to a transition in the A-X system while another dye laser was scanned throughout several vibronic bands in the B-X system. In addition to providing a substantially improved signal-to-noise ratio, this method allows for a check of the consistency between previous analyses of both optical systems.