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HOME>>커뮤니티>>세미나/콜로퀴엄

세미나/콜로퀴엄


첨부파일 :     Downloading : 16 - 기타.jpg
글제목 :     콜로퀴움)Hyperfine analysis of the excited states and continuous production of the lowest rovibronic gro
일시 :     2016년 9월 7일(목) 오후 4:30
장소 :     제1과학관 206호
연사 :     김진태 교수(조선대 광기술공학과)
 


p 제목 : Hyperfine analysis of the excited states and continuous production of the lowest rovibronic ground level of ultracold 85Rb133Cs molecules via short-range photoassociation



p 연사 : 김진태 교수(조선대 광기술공학과)



p 일시 : 2016년 9월 7일(목) 오후 4:30



p 장소 : 제1과학관 206호



p 요약 : Short-range photoassociation (PA), which produces continuously ultracold 85Rb133Cs molecules in the lowest rovibronic ground level X 1S+ (v = 0, J = 0), has opened up to investigate various hyperfine structures of deeply bound rovibrational levels in the strongly perturbed regions. Electronic states with strong singlet-triplet mixing can be useful for efficient direct molecule production in the rovibronic ground state via short-range PA. 85Rb and 133Cs atoms trapped in their |FRb=2> and |FCs=3> hyperfine states in dark SPOT MOTs were photoassociated into excited molecular states, which decay into the electronic ground state by spontaneous emission.



We have investigated deeply bound short-range PA lines of the B 1P (W = 1), c 3S+ (W = 0- and 1), and b 3P (W = 0-, 0+, and 1) states and the 2 1P(W = 1), 3 3S+(W = 1), and 2 3P(W = 1) states [1] of 85Rb133Cs dissociating into the 5s(Rb) + 6p(Cs) and 6s(Cs) + 5p(Rb) limits, respectively.



Rich hyperfine structures of those electronic states with the low J which were not observed in molecular beam [2] and the FTS [3], respectively have been explained mainly considering nuclear spin-electron orbital angular momentum, Fermi-contact, and dipolar electron spin-nuclear spin interactions. Through triplet-singlet spin-orbit electronic mixings, the singlet state often has larger HFS splittings and shows HFS structure like a triplet state unexpectedly although there is no electronic spin. Analysis of the hyperfine structures makes it possible to assign vibrational levels of singlet and triplet states which were not assigned due to strong spin-orbit interaction.



For selected PA levels, vibrational branching and rotational branching in the X 1S+ (v = 0) state have been investigated using resonance-enhanced multiphoton ionization and depletion spectroscopy [4], respectively. Efficient production of the rovibronic ground level X 1S+ (v = 0, J = 0) has been observed for some of the PA levels. Molecule production rate up to ~1×104 molecules /s into the lowest rovibronic ground level has been achieved.



학생들의 많은 참여 바랍니다(누구나 참석 가능).



 
 
 
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Kyungpook National University Department of Physics
#702-701 대구광역시 북구 산격동 1370번지 경북대학교 자연과학대학 물리학과 / Tel. 053-950-5316 / Fax. 053-952-1739 Copyrights 2011 KNU Department of Physics. All rights reserved. Designed by DMAX
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