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n-changing population of Rydberg states by low-energy electron-Rydberg collisions.
J Chem Phys
October 2024
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Inelastic n-changing collisions play an important role in the evolution of Rydberg atoms into ultracold plasmas. However, for the initially intermediate n (n ∼ 40) Rydberg states, these collisions can hardly be observed due to the low electron temperature in ultracold plasmas. In this work, we designed an experimental scheme to facilitate collisions between free electrons at 1.
View Article and Find Full Text PDFAn improved source of spin-polarized electrons based on spin exchange in optically pumped rubidium vapor.
Rev Sci Instrum
August 2023
Physics Department, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0299, USA.
We have improved a polarized electron source in which unpolarized electrons undergo collisions with a mixture of buffer gas molecules and optically spin-polarized Rb atoms. With a nitrogen buffer gas, the source reliably provides spin polarization between 15% and 25% with beam currents >4 μA. Vacuum pump upgrades mitigate problems caused by denatured diffusion pump oil, leading to longer run times.
View Article and Find Full Text PDFWe present a scheme to precisely resolve the unperturbed line shape of an optical rubidium clock transition in a high vacuum, by which we avoided the systematic errors of "collision shift" and "modulation shift." The spectral resolution resolved by this scheme is significantly improved such that we can use "Zeeman broadening" to inspect the stray magnetic field, through which we were able to compensate the magnetic field inside the Rb cells to be below 10-Â Gauss. We thus update the absolute frequency of the clock transition and propose a standard operation procedure (SOP) for the clock self-calibration.
View Article and Find Full Text PDFAccurate absolute frequency measurement of the S(2) transition in the fundamental band of H near 2.03 μm.
Phys Chem Chem Phys
August 2023
Univ. Grenoble Alpes, CNRS, LIPhy, Bat. E, 140 rue de la Physique, 38400 Saint-Martin d'Hères, France.
A series of spectra of the quadrupolar electric S(2) transition of H in the 1-0 band near 4917 cm has been recorded at seven pressure values between 2 and 100 Torr. The comb-referenced cavity ring down spectroscopy (CR-CRDS) technique was used for the recording of this very weak transition. The accuracy of the spectrum frequency axis is achieved by linking the CRDS setup to an optical frequency comb referenced to a GPS-referenced 10 MHz rubidium clock.
View Article and Find Full Text PDFTunable itinerant spin dynamics with polar molecules.
Nature
February 2023
JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, CO, USA.
Strongly interacting spins underlie many intriguing phenomena and applications ranging from magnetism to quantum information processing. Interacting spins combined with motion show exotic spin transport phenomena, such as superfluidity arising from pairing of spins induced by spin attraction. To understand these complex phenomena, an interacting spin system with high controllability is desired.
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