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Sr 35Cl is a candidate system for laser cooling. The spectrum and transition characteristics are very important for constructing laser cooling schemes. In this paper, the spectral properties are analyzed by using the Davidson's modified internal contraction multi-reference interaction (ic-MRCI + Q) method, in combination with the relativistic effective core pseudopotential group (aug-cc-pV5Z-PP) as the base group for the calculation of the Sr atom and the related consistent quintile aug-cc-pV5Z as the Cl atom. The potential energy curves and dipole moments of 14 low excited electron states of Sr 35Cl molecule are optimized. In order to obtain more accurate spectral parameters, nuclear valence electron correlation and relativistic effect correction are introduced into the calculation. Using the LEVEL 8.0 program to fit the modified potential energy curves of 5 bound states, the spectral properties such as spectral constants, vibration energy levels, and molecular constants of the corresponding electron states are obtained. The results show that there is a double potential well in
${\rm B}^2 \Sigma^+$ state and the cross phenomena are avoided in${\rm A}^2 \Pi$ and${\rm C}^2 \Pi$ ,${\rm B}^2 \Sigma^+$ and$3^2 \Sigma^+$ respectively. The spectrum and molecular constants are in good agreement with the recently obtained theoretical calculations and experimental values except the adiabatic excitation energy. It may be due to the fact that the effect of the interaction of electronic states is taken into account. The transition properties such as Frank-Condon factor and radiation lifetime are also given. It can be seen that the 0-0 band of${\rm B}^2 \Sigma^+$ −${\rm X}^2 \Sigma^+$ transition has the largest Franck-Condon factor of 0.861288, and the diagonalization is obvious, which is the condition for laser cooling. The lifetime of${\rm B}^2 \Sigma^+$ −${\rm X}^2 \Sigma^+$ transition is 38.89 ns, which is in accordance with the experimental value 39.6 ns ± l.6 ns. These precise spectral transition characteristics may provide theoretical support for further constructing the laser cooling scheme of Sr 35Cl molecule.-
Keywords:
- Sr35Cl molecule/
- internal contraction multi-reference interaction/
- spectroscopic and molecular constant/
- vibration levels/
- transition characteristics
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] -
Λ-S态 Te/cm−1 Re/nm $\omega $e/cm−1 $\omega $e$\chi $e/cm−1 Be/cm−1 104αe/cm−1 De/eV Re附近主要电子组态(%) $ {{\rm{X}}^{2}}\Sigma^+$ 0.0 0.2575 309.78 0.8682 0.1016 4.131 3.703 6$\text{σ}$27$\text{σ}$28$\text{σ}$α9$\text{σ}$03$\text{π}$24$\text{π}$2(78.8)
6${\rm{\sigma }}$27$\text{σ}$28$\text{σ}$09$\text{σ}$α3$\text{π}$24$\text{π}$2(7.5)理论[26] 0.0 0.255 313 0.93 0.1037 — — 实验[15] 0.0 0.257 302[27] 0.95[27] — — — 实验[16] 0.0 — 302.448 −0.9502 0.1016 4.524 — 实验[12] 0.0 — 302.3 0.950 — — — $ {{\rm{A}}^{2}}\Pi$ 15779.16 0.2518 330.69 — 0.1061 2.013 1.673 6$\text{σ}$27$\text{σ}$28$\text{σ}$09$\text{σ}$03$\text{π}$ααβ4$\text{π}$2(85.7) 理论[26] 14730 0.252 323 0.95 0.1055 — — 实验[15] 14818 0.255 309[27] 0.98[27] — — — 实验[16] 14966.727 — 309.625 0.996 0.1030 4.606 — $ {{\rm{B}}^{2}}\Sigma^+$ 16612.74 0.2538 318.67 0.4874 0.1043 2.599 1.937 6$\text{σ}$27$\text{σ}$28$\text{σ}$α9$\text{σ}$03$\text{π}$24$\text{π}$2(78.8)
6${\rm{\sigma }}$27$\text{σ}$28$\text{σ}$09$\text{σ}$α3$\text{π}$24$\text{π}$2(7.6)理论[26] 15714 0.253 319 0.99 0.1055 — — 实验[15] 15719 0.255 306[27] 0.98[27] 0.1030[16] — — 实验[12] 15719.5 — 306.4 0.98 — — — — $ {{\rm{C}}^{2}}\Pi$ 33532.99 0.3477 425.57 15.5691 0.0554 −11.932 1.546 6$\text{σ}$27$\text{σ}$28$\text{σ}$09$\text{σ}$03$\text{π}$ααβ4$\text{π}$2(59.7)
6$\text{σ}$27$\text{σ}$28$\text{σ}$29$\text{σ}$03$\text{π}$24$\text{π}$2(13.4)
6$\text{σ}$27$\text{σ}$α8$\text{σ}$β9$\text{σ}$03$\text{π}$ααβ4π2(9.8)
6$\text{σ}$27$\text{σ}$α8$\text{σ}$α9$\text{σ}$03$\text{π}$αββ4$\text{π}$2(2.7)理论[26] 26688 0.259 278 0.83 0.1095 — — 实验[27] 26099 — 270 0.72 — — — $ {{\rm{3}}^{2}}\Sigma^+$ 36625.55 0.3519 392.49 10.4544 0.0544 −12.567 1.140 6$\text{σ}$27$\text{σ}$α8$\text{σ}$29$\text{σ}$03$\text{π}$24$\text{π}$2(51.0)
6$\text{σ}$27$\text{σ}$28$\text{σ}$09$\text{σ}$α3$\text{π}$24$\text{π}$2(16.4)
6$\text{σ}$27$\text{σ}$28$\text{σ}$α9$\text{σ}$03$\text{π}$ααβ4$\text{π}$2(4.6)
6$\text{σ}$27$\text{σ}$28$\text{σ}$α9$\text{σ}$03$\text{π}$β4$\text{π}$ααβ(4.6)
6$\text{σ}$27$\text{σ}$28$\text{σ}$α9$\text{σ}$03$\text{π}$24$\text{π}$2(2.5)
6$\text{σ}$27$\text{σ}$28$\text{σ}$α9$\text{σ}$03$\text{π}$αββ4$\text{π}$2(1.6)
6$\text{σ}$27$\text{σ}$28$\text{σ}$09$\text{σ}$α3$\text{π}$α4$\text{π}$αββ(1.6)
6$\text{σ}$27$\text{σ}$α8$\text{σ}$09$\text{σ}$03$\text{π}$44$\text{π}$2(1.5)
6$\text{σ}$27$\text{σ}$α8$\text{σ}$09$\text{σ}$03$\text{π}$24$\text{π}$4(1.5)理论[26] 27979 0.248 358 1.01 0.1095 — — 实验[15] 28822 — 344[27] 1.04[27] 0.1030[16] — — 
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v 0 1 2 3 4 5 6 7 8 9 $ {{\rm{X}}^{2}}\Sigma^+$ Gv/cm−1 0 308.69 615.44 919.34 1220.80 1520.91 1820.07 2118.05 2414.53 2709.33 Bv/cm−1 0.101389 0.100964 0.100567 0.100209 0.099815 0.099369 0.098910 0.098467 0.098043 0.097629 108Dv/cm−1 4.351839 4.364577 4.467493 4.497514 4.362226 4.242542 4.234360 4.286016 4.334124 4.353049 $ {{\rm{A}}^{2}}\Pi$ Gv/cm−1 15953.74 16281.83 16598.43 16930.62 17269.01 17605.65 17940.04 18272.59 18603.52 18933.04 Bv/cm−1 0.106234 0.106462 0.106095 0.105137 0.104604 0.104235 0.103859 0.103475 0.103082 0.102679 108Dv/cm−1 4.461909 5.111509 3.253476 3.332790 4.007870 4.130323 4.085546 4.040997 3.976138 3.938946 $ {{\rm{B}}^{2}}\Sigma^+$ Gv/cm−1 16777.58 17097.77 17402.46 17705.63 18020.44 18339.16 18656.69 18972.44 19286.60 19599.30 Bv/cm−1 0.104260 0.104168 0.104392 0.103697 0.102831 0.102297 0.101900 0.101515 0.101130 0.100741 108Dv/cm−1 4.416717 5.342062 4.947374 3.120903 3.500412 4.129428 4.273733 4.244199 4.206411 4.139361 $ {{\rm{C}}^{2}}\Pi$ Gv/cm−1 33822.25 34298.68 34607.21 34880.81 35124.57 35352.15 35566.01 35770.85 35971.25 36169.15 Bv/cm−1 0.056049 0.057354 0.058912 0.059995 0.060974 0.062071 0.063032 0.063843 0.064515 0.065071 108Dv/cm−1 0.293093 1.069720 1.371596 2.128287 2.433073 3.023576 3.386636 3.382563 3.426546 3.529599 $ {{\rm{3}}^{2}}\Sigma^+$ Gv/cm−1 36879.56 37294.02 37638.56 37944.07 38221.43 38480.16 38726.99 38965.82 39199.02 39428.18 Bv/cm−1 0.055079 0.056481 0.057758 0.059028 0.060242 0.061377 0.062432 0.063414 0.064332 0.065193 108Dv/cm−1 0.363052 0.690909 1.002658 1.373820 1.690530 1.922724 2.122355 2.300506 2.453955 2.583320 DownLoad:
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v′′ = 0 1 2 3 4 5 6 7 8 9 $ {{\rm{A}}^{2}}\Pi$—$ {{\rm{X}}^{2}}\Sigma^+ $ v′ = 0 0.656888 0.266608 0.062027 0.011563 0.002170 0.000520 0.000163 0.000048 0.000007 0.000000 1 0.272308 0.192420 0.320947 0.150685 0.466479 0.012567 0.033544 0.008655 0.000174 0.000137 2 0.061741 0.365100 0.012591 0.236003 0.200935 0.086356 0.027568 0.007557 0.001791 0.000312 3 0.008378 0.145153 0.330434 0.013476 0.132392 0.200767 0.112395 0.041433 0.012093 0.002903 4 0.000641 0.027499 0.211170 0.231162 0.064589 0.062086 0.184983 0.134977 0.058263 0.018761 5 0.000040 0.003015 0.053925 0.25428 0.132467 0.115528 0.018774 0.155878 0.151198 0.077211 6 0.000004 0.000182 0.008221 0.084623 0.271397 0.058393 0.151118 0.000803 0.117380 0.157174 7 0.000000 0.000021 0.006253 0.016398 0.117920 0.263055 0.014702 0.164939 0.005113 0.077068 8 0.000000 0.000000 0.000052 0.001674 0.027547 0.151418 0.233623 0.000068 0.157208 0.024940 9 0.000000 0.000000 0.000007 0.000118 0.003627 0.041888 0.181283 0.190225 0.008630 0.133109 $ {{\rm{B}}^{2}}\Sigma^+$—$ {{\rm{X}}^{2}}\Sigma^+ $ v′ = 0 0.861288 0.125494 0.011927 0.001065 0.000142 0.000047 0.000025 0.000091 0.000000 0.000000 1 0.129692 0.603795 0.220001 0.038332 0.006251 0.001365 0.000411 0.000120 0.000019 0.000000 2 0.008650 0.241321 0.360072 0.284163 0.081308 0.018646 0.004456 0.001109 0.000226 0.000018 3 0.000365 0.027661 0.352567 0.179385 0.288215 0.112584 0.030079 0.007227 0.001600 0.000265 4 0.000002 0.001707 0.051462 0.411903 0.083378 0.268533 0.131641 0.039281 0.009668 0.002055 5 0.000001 0.000017 0.003843 0.078423 0.421433 0.034730 0.246976 0.148790 0.049663 0.012870 6 0.000000 0.000000 0.000117 0.006341 0.108918 0.407382 0.009402 0.221296 0.163711 0.061334 7 8 0.000000 0.000000 0.000003 0.000002 0.000001 0.000007 0.000333 0.000002 0.009581 0.000763 0.141252 0.014168 0.381199 0.173321 0.000074 0.346687 0.190975 0.003801 0.174597 0.158106 9 0.000000 0.000000 0.000000 0.000000 0.000000 0.001272 0.020484 0.203605 0.306437 0.017104 $ {{\rm{C}}^{2}}\Pi$—$ {{\rm{X}}^{2}}\Sigma^+ $ v′ = 0 0.000002 0.000057 0.000400 0.002491 0.013257 0.048381 0.121107 0.211164 0.245963 0.199742 1 0.000028 0.000755 0.003923 0.016478 0.054711 0.112499 0.129055 0.063035 0.000478 0.054393 2 0.000216 0.004536 0.018057 0.052861 0.110648 0.119527 0.040456 0.002385 0.059184 0.058927 3 0.000894 0.014294 0.042688 0.083192 0.097065 0.033697 0.003920 0.060262 0.039865 0.000817 $ {{\rm{3}}^{2}}\Sigma^+$—$ {{\rm{X}}^{2}}\Sigma^+ $ v′ = 0 0.000005 0.000160 0.001014 0.005583 0.025973 0.082035 0.174625 0.263266 0.237744 0.147940 1 0.000072 0.001726 0.007985 0.028959 0.080861 0.133268 0.106890 0.018946 0.019348 0.137924 2 0.000444 0.008122 0.028147 0.068699 0.114064 0.085695 0.008341 0.025544 0.075168 0.024261 3 0.001887 0.025614 0.064048 0.096749 0.076464 0.007949 0.023664 0.062244 0.010184 0.021472 4 0.005823 0.057375 0.098715 0.079207 0.013459 0.015420 0.056215 0.010480 0.018687 0.044825 5 0.013104 0.091074 0.099009 0.027450 0.005603 0.051927 0.016773 0.012448 0.040966 0.001448 6 0.023467 0.109148 0.062336 0.000039 0.043234 0.033313 0.003366 0.042212 0.004752 0.023015 7 0.036552 0.106016 0.020316 0.019085 0.055807 0.001734 0.035028 0.017051 0.012699 0.031310 8 0.052050 0.085867 0.000431 0.051861 0.028088 0.011562 0.037256 0.000833 0.036176 0.001957 9 0.069548 0.057189 0.008529 0.060907 0.001791 0.038489 0.008713 0.024666 0.015229 0.013407 DownLoad:
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Transition Radiative lifetimes/ns v′ = 0 v′ = 1 v′ = 2 $ {{\rm{A}}^{2}}\Pi $—$ {{\rm{X}}^{2}}\Sigma^+ $ 31.23 31.35 31.56 $ {{\rm{B}}^{2}}\Pi $—$ {{\rm{X}}^{2}}\Sigma^+ $ 38.83 38.89 39.12 $ {{\rm{C}}^{2}}\Pi$—$ {{\rm{X}}^{2}}\Sigma^+ $ 25.92 26.01 26.18 DownLoad:
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[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35]
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