Zobrazeno 1 - 10
of 1 851
pro vyhledávání: '"Barker, A. S."'
Autor:
Eckel, Stephen P., Barker, Daniel S., Fedchak, James A., Kłos, Jacek, Scherschligt, Julia, Tiesinga, Eite
We theoretically investigate the effect of ``glancing" collisions on the ultra-high vacuum (UHV) pressure readings of the cold atom vacuum standard (CAVS), based on either ultracold $^7$Li or $^{87}$Rb atoms. Here, glancing collisions are those colli
Externí odkaz:
http://arxiv.org/abs/2409.11226
We show that optomechanical systems can be primary pressure sensors with uncertainty as low as 1.1 % of reading via comparison with a pressure transfer standard. Our silicon nitride and silicon carbide sensors are short-term and long-term stable, dis
Externí odkaz:
http://arxiv.org/abs/2409.00256
Autor:
Barker, D. S., Elgee, P. K., Sitaram, A., Norrgard, E. B., Klimov, N. N., Campbell, G. K., Eckel, S.
We study the forces and optical pumping within grating magneto-optical traps (MOTs) operating on transitions with non-trivial level structure. In contrast to the standard six-beam MOT configuration, rate equation modelling predicts that the asymmetri
Externí odkaz:
http://arxiv.org/abs/2305.07732
Autor:
Rodriguez, Kayla J., Pilgram, Nickolas H., Barker, Daniel S., Eckel, Stephen P., Norrgard, Eric B.
Publikováno v:
Phys. Rev. A 108, 033105 (2023)
We simulate the capture process of MgF molecules into a frequency-chirped molecular MOT. Our calculations show that by chirping the frequency, the MOT capture velocity is increased by about of factor of 4 to 80 m/s, allowing for direct loading from a
Externí odkaz:
http://arxiv.org/abs/2305.04879
Heat and pressure are ultimately transmitted via quantized degrees of freedom, like gas particles and phonons. While a continuous Brownian description of these noise sources is adequate to model measurements with relatively long integration times, su
Externí odkaz:
http://arxiv.org/abs/2303.09922
Autor:
Barker, Daniel S., Fedchak, James A., Kłos, Jacek, Scherschligt, Julia, Sheikh, Abrar A., Tiesinga, Eite, Eckel, Stephen P.
Publikováno v:
AVS Quantum Sci. 5 035001 (2023)
We present measurements of thermalized collisional rate coefficients for ultra-cold $^7$Li and $^{87}$Rb colliding with room-temperature He, Ne, N$_2$, Ar, Kr, and Xe. In our experiments, a combined flowmeter and dynamic expansion system, a vacuum me
Externí odkaz:
http://arxiv.org/abs/2302.12143
Autor:
Ehinger, Lucas H., Acharya, Bishnu P., Barker, Daniel S., Fedchak, James A., Scherschligt, Julia, Tiesinga, Eite, Eckel, Stephen
Publikováno v:
AVS Quantum Sci. 4, 034403 (2022)
We compare the vacuum measured by two portable cold-atom vacuum standards (pCAVS) based on ultracold $^7$Li atoms. The pCAVS are quantum-based standards that use a priori scattering calculations to convert a measured loss rate of cold atoms from a co
Externí odkaz:
http://arxiv.org/abs/2204.03705
Publikováno v:
In Cortex November 2024 180:42-54
Autor:
Tula, T., Möller, G., Quintanilla, J., Giblin, S. R., Hillier, A. D., McCabe, E. E., Ramos, S., Barker, D. S., Gibson, S.
Publikováno v:
J. Phys.: Conf. Ser. 2164, 012018 (2022)
Machine learning (ML) methods have proved to be a very successful tool in physical sciences, especially when applied to experimental data analysis. Artificial intelligence is particularly good at recognizing patterns in high dimensional data, where i
Externí odkaz:
http://arxiv.org/abs/2112.09601
Autor:
Norrgard, E. B., Barker, D. S., Eckel, S. P., Porsev, S. G., Cheung, C., Kozlov, M. G., Tupitsyn, I. I., Safronova, M. S.
Here we report measured and calculated values of decay rates of the 3d$^4$($^5$D)4s4p($^3$P$^{\rm{o}}$)\ y$^7$P$^{\rm{o}}_{2,3,4}$ states of Cr I. The decay rates are measured using time-correlated single photon counting with roughly 1% total uncerta
Externí odkaz:
http://arxiv.org/abs/2111.12049