Production and Detection of Ultracold Ground State ⁸⁵Rb¹³³Cs Molecules in the Lowest Vibrational Level by Short-Range Photoassociation

【摘要】 We investigate the production of ultracold ground state X¹E⁺（v = 0） RbCs molecules in the lowest vibrational level via short-range photoassociation followed by spontaneous emission.The starting point is the laser cooled ⁸⁵Rb and ¹33)Cs atoms in a dual species,forced dark magneto-optical trap.The special intermediate level（5）0⁺（v = 10） correlated to the（2）³Ⅱ electric state is achieved by the photoassociation process.The formed ground state X¹E⁺（v = 0） molecule is resonantly excited to the 2¹Ⅱ intermediate state by a 651 nm pulse laser and is ionized by a 532 nm pulse laser and then detected by the time-of-flight mass spectrum.Saturation of the photoionization spectroscopy at large ionization laser energy is observed and the ionization efficiency is obtained from the fitting.The production of ultracold ground state ⁸⁵Rb¹³³Cs molecules is facilitative for the further research about the manipulation of ultracold molecules in the rovibrational ground state.更多还原

【Abstract】 We investigate the production of ultracold ground state X¹E⁺（v = 0） RbCs molecules in the lowest vibrational level via short-range photoassociation followed by spontaneous emission.The starting point is the laser cooled ⁸⁵Rb and ¹33)Cs atoms in a dual species,forced dark magneto-optical trap.The special intermediate level（5）0⁺（v = 10） correlated to the（2）³Ⅱ electric state is achieved by the photoassociation process.The formed ground state X¹E⁺（v = 0） molecule is resonantly excited to the 2¹Ⅱ intermediate state by a 651 nm pulse laser and is ionized by a 532 nm pulse laser and then detected by the time-of-flight mass spectrum.Saturation of the photoionization spectroscopy at large ionization laser energy is observed and the ionization efficiency is obtained from the fitting.The production of ultracold ground state ⁸⁵Rb¹³³Cs molecules is facilitative for the further research about the manipulation of ultracold molecules in the rovibrational ground state.更多还原