The transition dipole moments(TDMs) of ultracold85 Rb133 Cs molecules between the lowest vibrational ground level, (X^1Σ~+( v= 0, J= 1), and the two excited rovibrational levels, 2~3Π0+(v′= 10, J′= 2) and...The transition dipole moments(TDMs) of ultracold85 Rb133 Cs molecules between the lowest vibrational ground level, (X^1Σ~+( v= 0, J= 1), and the two excited rovibrational levels, 2~3Π0+(v′= 10, J′= 2) and 2~1Π1(v′= 22,J′= 2), are measured using depletion spectroscopy. The ground-state85 Rb133 Cs molecules are formed from cold mixed component atoms via the 2~3Π0-( v= 11, J= 0) short-range level, then detected by time-of-flight mass spectrum. A home-made external-cavity diode laser is used as the depletion laser to couple the ground level and the two excited levels. Based on the depletion spectroscopy, the corresponding TDMs are then derived to be 3.5(2)×10^(-3)eαα and 1.6(1)×10^(-2)eαα, respectively, where 0)(60 represents the atomic unit of electric dipole moment. The enhance of TDM with nearly a factor of 5 for the 21Π1(v′= 22, J′= 2) excited level means that it has stronger coupling with the ground level. It is meaningful to find more levels with much more strong coupling strength by the represented depletion spectroscopy to realize direct stimulated Raman adiabatic passage transfer from scattering atomic states to deeply molecular states.展开更多
The optical frequency comb has been widely used in precision measurement. In this study, a multi-peak fitting approach is first proposed to fit the two-photon transition spectrum which overlaps with the neighboring tr...The optical frequency comb has been widely used in precision measurement. In this study, a multi-peak fitting approach is first proposed to fit the two-photon transition spectrum which overlaps with the neighboring transition in Rb-87. The multi-peak fitting approach is used to eliminate the frequency shift affected by the neighboring transition. With locking the carrier envelope offset frequency at 1/4 repetition frequency, the transition frequency is measured to be 770569132739.9 +/- 5.8 kHz, which agrees well with the previous result recommended by Comite International des Poids et Mesures.展开更多
Compared with the open saphenous vein harvesting (OVH), there is a larger decrease in inci-sion complications of endoscopic vein harvesting (EVH). Fewer studies were conducted to evaluate the quality of great saph...Compared with the open saphenous vein harvesting (OVH), there is a larger decrease in inci-sion complications of endoscopic vein harvesting (EVH). Fewer studies were conducted to evaluate the quality of great saphenous vein (SVG) harvesting by these two methods. To apply transit time flow measurement (TTFM) to SVG grafts in coronary artery bypass grafting (CABG), we properly evaluate the quality of SVG and surgical effect. Methods From January 2012 to August 2012, 38 cases underwent EVH and 16 cases underwent OVH. We recorded pulsatility index (PI), mean graft flow (MGF) and diastolic flow (DF) of SVG grafts for statistical analysis. The dysfunctional grafts diagnostic criteria is PI 〉 5, MGF 〈 10 mL/min or DF 〈 50%. Result In terms of SVG grafts, no significant difference existed in the length of two groups (P = 0.2395). EVH group har-vesting time was longer than OVH group (P = 0.0113), but the incision length of EVH group was shorter (P = 0.0000) and it needed less suture time. EVH group presented no significant differences in incision complication rate from OVH group (P = 0.7055) within 1 month after surgery. TTFM data of well functioning grafts had no significant difference in the two groups (PI: 3.2 ± 1.0 vs. 2.9 ± 0.9, MGF: 34.7 ± 20.4 vs. 36.3 ± 19.2 mL / min, DF: 66.3% ± 10.6% vs. 68.5% ± 10.3%). There was no significant difference in the rate of dysfunctional grafts in two groups (P = 0.7954) as well. The cause for tomosed the grafts with satisfactory effect. Conclusion vesting methods. The surgical effect and the quality of quality of SVG grafts can be reasonably evaluated by TYFM.展开更多
基金Supported by the National Key Research and Development Program of China under Grant No 2017YFA0304203the National Natural Science Foundation of China under Grant Nos 61675120 and 11434007+3 种基金the National Natural Science Foundation of China for Excellent Research Team under Grant No 61121064the Shanxi Scholarship Council of China,the 1331KSCthe PCSIRT under Grant No IRT13076the Applied Basic Research Project of Shanxi Province under Grant No 201601D202008
文摘The transition dipole moments(TDMs) of ultracold85 Rb133 Cs molecules between the lowest vibrational ground level, (X^1Σ~+( v= 0, J= 1), and the two excited rovibrational levels, 2~3Π0+(v′= 10, J′= 2) and 2~1Π1(v′= 22,J′= 2), are measured using depletion spectroscopy. The ground-state85 Rb133 Cs molecules are formed from cold mixed component atoms via the 2~3Π0-( v= 11, J= 0) short-range level, then detected by time-of-flight mass spectrum. A home-made external-cavity diode laser is used as the depletion laser to couple the ground level and the two excited levels. Based on the depletion spectroscopy, the corresponding TDMs are then derived to be 3.5(2)×10^(-3)eαα and 1.6(1)×10^(-2)eαα, respectively, where 0)(60 represents the atomic unit of electric dipole moment. The enhance of TDM with nearly a factor of 5 for the 21Π1(v′= 22, J′= 2) excited level means that it has stronger coupling with the ground level. It is meaningful to find more levels with much more strong coupling strength by the represented depletion spectroscopy to realize direct stimulated Raman adiabatic passage transfer from scattering atomic states to deeply molecular states.
基金Supported by the National Natural Science Foundation of China under Grant Nos 91336103,10934010 and 61078026
文摘The optical frequency comb has been widely used in precision measurement. In this study, a multi-peak fitting approach is first proposed to fit the two-photon transition spectrum which overlaps with the neighboring transition in Rb-87. The multi-peak fitting approach is used to eliminate the frequency shift affected by the neighboring transition. With locking the carrier envelope offset frequency at 1/4 repetition frequency, the transition frequency is measured to be 770569132739.9 +/- 5.8 kHz, which agrees well with the previous result recommended by Comite International des Poids et Mesures.
文摘Compared with the open saphenous vein harvesting (OVH), there is a larger decrease in inci-sion complications of endoscopic vein harvesting (EVH). Fewer studies were conducted to evaluate the quality of great saphenous vein (SVG) harvesting by these two methods. To apply transit time flow measurement (TTFM) to SVG grafts in coronary artery bypass grafting (CABG), we properly evaluate the quality of SVG and surgical effect. Methods From January 2012 to August 2012, 38 cases underwent EVH and 16 cases underwent OVH. We recorded pulsatility index (PI), mean graft flow (MGF) and diastolic flow (DF) of SVG grafts for statistical analysis. The dysfunctional grafts diagnostic criteria is PI 〉 5, MGF 〈 10 mL/min or DF 〈 50%. Result In terms of SVG grafts, no significant difference existed in the length of two groups (P = 0.2395). EVH group har-vesting time was longer than OVH group (P = 0.0113), but the incision length of EVH group was shorter (P = 0.0000) and it needed less suture time. EVH group presented no significant differences in incision complication rate from OVH group (P = 0.7055) within 1 month after surgery. TTFM data of well functioning grafts had no significant difference in the two groups (PI: 3.2 ± 1.0 vs. 2.9 ± 0.9, MGF: 34.7 ± 20.4 vs. 36.3 ± 19.2 mL / min, DF: 66.3% ± 10.6% vs. 68.5% ± 10.3%). There was no significant difference in the rate of dysfunctional grafts in two groups (P = 0.7954) as well. The cause for tomosed the grafts with satisfactory effect. Conclusion vesting methods. The surgical effect and the quality of quality of SVG grafts can be reasonably evaluated by TYFM.