Theoretical Study on Laser Cooling of Strontium Chloride Molecules

Yulong Han; Dong Cheng; Hui Sun; Jinfang Sun; Baohang Zhou; Eryin Feng

doi:10.3788/LOP202259.0702001

Journals >Laser & Optoelectronics Progress >Volume 59 >Issue 7 >Page 0702001 > Article

Laser & Optoelectronics Progress
Vol. 59, Issue 7, 0702001 (2022)

Theoretical Study on Laser Cooling of Strontium Chloride Molecules

Yulong Han^1、2、*, Dong Cheng^2、3, Hui Sun¹, Jinfang Sun¹, Baohang Zhou¹, and Eryin Feng^2、**

Author Affiliations

¹General Education & Foreign Language College, Anhui Institute of Information Technology, Wuhu , Anhui 241000, China

²College of Physics and Electronic Information, Anhui Normal University, Wuhu , Anhui 241000, China

³Wuhu School Affiliated to Beijing Normal University, Wuhu , Anhui 241000, China

show less

DOI: 10.3788/LOP202259.0702001 Cite this Article Set citation alerts

Yulong Han, Dong Cheng, Hui Sun, Jinfang Sun, Baohang Zhou, Eryin Feng. Theoretical Study on Laser Cooling of Strontium Chloride Molecules[J]. Laser & Optoelectronics Progress, 2022, 59(7): 0702001 Copy Citation Text

show less

Fig. 1. Potential energy curves of SrCl in Λ-S states

Download full size

Transition diopole moment curves of A2Π-X2Σ+,D2Π-X2Σ+, A2Π-B2Σ+, and D2Π-B2Σ+

Fig. 2. Transition diopole moment curves of A²Π-X²Σ⁺,D²Π-X²Σ⁺, A²Π-B²Σ⁺, and D²Π-B²Σ⁺

Download full size

Fig. 3. Franck-Condon factors of A²Π(ν')-X²Σ⁺(ν'')

Download full size

Fig. 4. Comparison of Franck-Condon factors calculated by two methods of RKR and ab initio

Download full size

Fig. 5. Proposed laser cooling scheme for SrCl using A²Π(ν′)-X²Σ(ν″) transitions (solid arrows) and spontaneous decays (dashed arrows) with vibrational branching ratios R_ν′ν″

Download full size

Λ-S state	Data type	T_e /cm^-1	R_e /Å	ω_e /cm^-1	ω_eχ_e /cm^-1	Main electron configuration near equilibrium position （Weight /%）
X²Σ⁺	Proposed	0.0	2.5816^a	300.6^a	0.9^a	7σ²3π⁴8σ¹（94%）
	Exp.	0.0	2.57^b	302.448^b	0.950^b	-
	Cal.	0.0	2.55^f	313^f	0.93^f	-
A²Π	Proposed	14410.4^a	2.5589^a	308.9^a	0.9^a	7σ²3π⁴4π¹（87%）
	Exp.	14966.727^c	2.55^d	309.625^c	0.996^c	-
	Cal.	14730^f	2.52^f	323^f	0.95^f	-
B²Σ⁺	Proposed	15424.1^a	2.5630^a	303.7^a	1.0^a	7σ²3π⁴9σ¹（91%）
	Exp.	15722.827^b	2.55^d	307.056^b	1.0156^b	-
	Cal.	15714^f	2.53^f	319^f	0.99^f	-
C²Δ	Proposed	18532.1^a	2.5916^a	287.4^a	0.9^a	7σ²3π⁴10σ¹（98%）
	Exp.	-	-	-	-	-
	Cal.	18197^f	2.56^f	314^f	0.92^f	-
D²Π	Proposed	26255.7^a	2.6185^a	278.8^a	0.9^a	7σ²3π⁴5π¹（86%）
	Exp.	25399.8^e	-	283.4^e	0.92^e	-
	Cal.	26688^f	2.59^f	278^f	0.83^f	-

Table 1. Spectroscopic parameters of five bound states of SrCl

State	X²Σ⁺（ν″=0）	X²Σ⁺（ν″=1）	X²Σ⁺（ν″=2）	X²Σ⁺（ν″=3）	X²Σ⁺（ν″=4）
A²Π（ν'=0）	0.96959	0.02946	0.00090	0.00005	0.00000
A²Π（ν'=1）	0.03020	0.90611	0.06184	0.00176	0.00009
A²Π（ν'=2）	0.00019	0.06295	0.83887	0.09396	0.00387
A²Π（ν'=3）	0.00001	0.00143	0.09544	0.77435	0.12244
A²Π（ν'=4）	0.00001	0.00005	0.00285	0.12446	0.71330

Table 2. Calculated Franck-Condon factors for A²Π(ν')-X²Σ⁺(ν'') transition of SrCl molecules

State	Parameter	X²Σ⁺（ν''=0）	X²Σ⁺（ν''=1）	X²Σ⁺（ν''=2）	X²Σ⁺（ν''=3）
A²Π（ν'=0）	A_ν'ν'' /s^-1	3.14×10⁷	8.42×10⁵	4.07×10³	1.72×10²
	τ_ν'ν'' /ns	3.18×10	1.19×10³	2.46×10⁵	5.81×10⁶
	R_ν'ν''	9.74×10^-1	2.61×10^-2	1.27×10^-4	5.35×10^-6
A²Π（ν'=1）	A_ν'ν'' /s^-1	1.10×10⁶	2.92×10⁷	1.75×10⁶	3.39×10⁴
	τ_ν'ν'' /ns	9.09×10²	3.42×10	5.71×10²	2.95×10⁴
	R_ν'ν''	3.43×10^-2	9.10×10^-1	5.46×10^-2	1.06×10^-3
A²Π（ν'=2）	A_ν'ν'' /s^-1	3.71×10⁴	2.30×10⁶	2.71×10⁷	2.66×10⁶
	τ_ν'ν'' /ns	2.70×10⁴	4.35×10²	3.69×10	3.76×10²
	R_ν'ν''	1.15×10^-3	7.17×10^-2	8.42×10^-1	8.27×10^-2

Table 3. Einstein coefficients,spontaneous radiative lifetimes,and vibrational branching ratios of A²Π(ν')-X²Σ⁺(ν'')

Yulong Han, Dong Cheng, Hui Sun, Jinfang Sun, Baohang Zhou, Eryin Feng. Theoretical Study on Laser Cooling of Strontium Chloride Molecules[J]. Laser & Optoelectronics Progress, 2022, 59(7): 0702001

Download Citation

Set citation alerts for the article

Tools

Set citation alerts for the article

Save the article for my favorites

Paper Information