Analysis of strongly perturbed 1 1 P – 2 3 S + – b 3 P states of the KRb molecule J. T. Kim 1 , Y. Lee 2 , and B. Kim 3 1 Department of Photonic Engineering, Chosun University. 2 Department of Chemistry, Mokpo National University. 3 Department of Chemistry, KAIST. D. Wang Department of Physics, The Chinese University of Hong Kong. W. C. Stwalley, P. L. Gould, and E. E. Eyler Physics Department, University of Connecticut. Supported by the National Science Foundation, the Air Force Office of Scientific Research, the National Research Foundation of Korea, and KOSEF through NRL in Korea.
17
Embed
Analysis of strongly perturbed 1 1 – 2 3 + – b 3 states of the KRb molecule J. T. Kim 1, Y. Lee 2, and B. Kim 3 1 Department of Photonic Engineering,
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Analysis of strongly perturbed1 1P – 2 3S+ – b 3P states of the KRb molecule
J. T. Kim1, Y. Lee2, and B. Kim3
1Department of Photonic Engineering, Chosun University.2Department of Chemistry, Mokpo National University.3Department of Chemistry, KAIST.
D. WangDepartment of Physics, The Chinese University of Hong Kong.
W. C. Stwalley, P. L. Gould, and E. E. EylerPhysics Department, University of Connecticut.
Supported by the National Science Foundation, the Air Force Office of Scientific Research, the National Research
Foundation of Korea, and KOSEF through NRL in Korea.
• Initial state for ultracold molecule (UM) spectra isa 3S+, mainly in v=20 and v=21, at low J.
• Initial state for molecular beam (MB) spectra is X 1S+, v=0 and v=1, at low J.
Motivation I: Assignment ofperturbed spectra
2 4 6 8 10 12 14 16 180
5
10
15
Ener
gy (X
103 c
m-1
)
R (Å)
X 1S+(v =0, J )a 3S+(v, J)
b 3P
2 3S+1 1P
K(4S1/2)+Rb(5PJ)
K(4S1/2)+Rb(5S1/2)
• Selection rules allow only W=1 for triplet states in the MB spectra, but W=0,1,2 for UM spectra.
• No rotational resolution due to pulsed laser linewidth, ~ 0.1 cm−1.
• To date, molecules with T < 1 mK can be produced only by combining ultracold atoms using photoassociation (PA) or magnetoassociation (MA).
• Both normally produce levels of very high v.
• Transfer to low v requires either:
1. Unusual PA mechanisms (e.g., FOPA).
2. Resonant coupling of small-R and large R levels due to electronic perturbations.
3. STIRAP-type Raman transfer. Optimal path often not obvious. The MB-UM method identifies it automatically.
Motivation II: how to producev=0 molecules?
Experimental scheme for UM (Storrs)
1) PA to form ultracold KRb*.
2) Spontaneous decay into the triplet ground state, a 3Σ+.
3) REMPI detection via intermediate states e(v, J ) .
2 4 6 8 10 12 14 16 180
5
10
15
Ener
gy (X
103 c
m-1
)
R (Å)
Ionization Continuum
PASpont. Emission
REMPI
X 1S+(v =0, J )a 3S+(v, J)
b 3P
2 3S+1 1P
e(v , J )e (v , J )K(4S1/2)+Rb(5PJ)
K(4S1/2)+Rb(5S1/2)
Experimental scheme for MB (Korea)
2 4 6 8 10 12 14 16 180
5
10
15
Ener
gy (X
103 c
m-1
)
R (Å)
Ionization Continuum
MB RE2PI
X 1S+(v =0, J )a 3S+(v, J)
b 3P
2 3S+1 1P
e (v , J )K(4S1/2)+Rb(5PJ)
K(4S1/2)+Rb(5S1/2)
1) Supersonic beam forms X 1S+ with v=0, 1.
2) REMPI detection via intermediate states e(v, J ).