Quantum State Singlet-Triplet Character Control in 7Li2

We have demonstrated a means of quantum control by all-optical control of valence electron spin polarization in the lithium dimer. The energy levels of interest are two closely spaced rovibrational levels (the G1Πg (12, 21f) and 13Sg- (1, 21f) states separated by 720 MHz). In the absence of any optical fields, the spin-orbit interaction couples the two states, resulting in each state being a mixture of the pure singlet and pure triplet states. The initial mixing coefficients are governed by the strength of the spin-orbit coupling between the two levels. In lithium dimer, this mixing is very weak; the nominal singlet (triplet) state is initially 87% singlet (triplet) and 13% triplet (singlet). When a strong coupling field is applied to the nominally singlet state, an Autler-Townes (AT) split pair is created. Since one of the AT components is pushed closer in energy to the nearby triplet state, the triplet state gains more singlet character. Since the AT splitting is dependent upon the magnitude of the applied coupling field Rabi frequency, the mixing coefficients of the perturbed pair can therefore be coherently controlled. Such control may be useful for applications in cold molecule formation and control of predissociation rates, and may also provide insight into the role that valence electron spin polarization plays in reactive collisions.

Grantor dc:publisher

Temple University. Libraries

Year dc:date.issued

2010

Author dc:creator

• Ingram, Sonja Sue

Advisor dc:contributor.advisor

• Lyyra, A. Marjatta

Committee members dc:contributor.committeemember

• Forster, Dieter, 1938-
• Santamore, Deborah
• Huennekens, John
• Spano, Francis C.
• Matsika, Spiridoula

• Physics, Optics
• Physics, Molecular
• Control
• Molecular
• Optics
• Quantum

Statement dc:rights

• IN COPYRIGHT- This Rights Statement can be used for an Item that is in copyright. Using this statement implies that the organization making this Item available has determined that the Item is in copyright and either is the rights-holder, has obtained permission from the rights-holder(s) to make their Work(s) available, or makes the Item available under an exception or limitation to copyright (including Fair Use) that entitles it to make the Item available.

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

eng

Dc Identifier Other

864884842

OAI identifier oai:identifier

oai:scholarshare.temple.edu:20.500.12613/1495