Physical Review A

Blackbody-radiation-induced resonances between Rydberg-Stark states of Na

Enrique J. Galvez, C. W. MacGregor, B. Chaudhuri, Subhadeep Gupta, E. Massoni, F. De Zela

Published Apr 1, 1997• 12 citations

Abstract

We report on measurements of the population of Rydberg states of Na in a constant electric field that result when 300-K blackbody radiation induces transitions from initial states with |m|=0,1 to neighboring states. Our measurements included comprehensive ranges of initial states (${\mathrm{n}}_{\mathrm{i}}^{\mathrm{*}}$=24--29), repopulation times (${\mathrm{t}}_{\mathrm{d}}$=0--50 \ensuremath{\mu}s), and fields (${\mathrm{F}}_{\mathrm{s}}$=175--712 V/cm). We find that the population is redistributed nonuniformly among states neighboring the initial state, reflective of sharp resonances between the states. By comparing calculations of transition probabilities in Na to the data for ${\mathrm{F}}_{\mathrm{s}}$=200 V/cm we were able to identify the populated states. Comparisons with calculations in H reveal that these resonances are hydrogenic.

DOI: 10.1103/physreva.55.3002

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Multistep transitions between Rydberg states of Na induced by blackbody radiation

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Physical Review A

Blackbody-radiation-induced resonances between Rydberg-Stark states of Na

Enrique J. Galvez, C. W. MacGregor, B. Chaudhuri, Subhadeep Gupta, E. Massoni, F. De Zela

Published Apr 1, 1997• 12 citations

Publisher

Abstract

{\mathrm{n}}_{\mathrm{i}}^{\mathrm{*}}

=24--29), repopulation times (

{\mathrm{t}}_{\mathrm{d}}

=0--50 \ensuremath{\mu}s), and fields (

{\mathrm{F}}_{\mathrm{s}}

=175--712 V/cm). We find that the population is redistributed nonuniformly among states neighboring the initial state, reflective of sharp resonances between the states. By comparing calculations of transition probabilities in Na to the data for

{\mathrm{F}}_{\mathrm{s}}

=200 V/cm we were able to identify the populated states. Comparisons with calculations in H reveal that these resonances are hydrogenic.

DOI: 10.1103/physreva.55.3002

Related papers

Multistep transitions between Rydberg states of Na induced by blackbody radiation

Enrique J. Galvez, John R. Lewis, B. Chaudhuri +5 more

We report on measurements of the time dependence of the populations of Rydberg states of Na with n=25--33 produced by stepwise excitation or deexcitation from the initially populated state 28s, stimulated by room-temperature blackbody radiation. We also present a theoretical modeling of the experiments, which mainly consists of solving the set of coupled rate equations for all the states involved. The results of the calculations show that for times of the order of the lifetime of 28s the populations of ns and nd states produced via two-step transitions can be up to 30% of the populations of np states. We also find that np states get repopulated via three-step transitions at the 2--12 % level. A comparison between the data and calculations shows good agreement.We report on measurements of the time dependence of the populations of Rydberg states of Na with n=25--33 produced by stepwise excitation or deexcitation from the initially populated state 28s, stimulated by room-temperature blackbody radiation. We also present a theoretical modeling of the experiments, which mainly consists of solving the set of coupled rate equations for all the states involved. The results of the calculations show that for times of the order of the lifetime of 28s the populations of ns and nd states produced via two-step transitions can be up to 30% of the populations of np states. We also find that np states get repopulated via three-step transitions at the 2--12 % level. A comparison between the data and calculations shows good agreement.

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John W. Farley, William H. Wing

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Ilya I. Beterov, Denis B. Tretyakov, I. I. Ryabtsev +2 more

Results of theoretical calculations of ionization rates of Rb and Na Rydberg atoms by blackbody radiation (BBR) are presented. Calculations have been performed for $nS$ , $nP$ , and $nD$ states of Na and Rb, which are commonly used in a variety of experiments, at principal quantum numbers $n=8--65$ and at three ambient temperatures of 77, 300, and $600\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ . A peculiarity of our calculations is that we take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of measured ionization rates and shapes of their dependences on $n$ . The calculated ionization rates are compared with the results of our earlier measurements of BBR-induced ionization rates of Na $nS$ and $nD$ Rydberg states with $n=8--20$ at $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ . A good agreement for all states except $nS$ with $n>15$ is observed. We also present the useful analytical formulas for the quick estimation of BBR ionization rates of Rydberg atoms.Results of theoretical calculations of ionization rates of Rb and Na Rydberg atoms by blackbody radiation (BBR) are presented. Calculations have been performed for $nS$, $nP$, and $nD$ states of Na and Rb, which are commonly used in a variety of experiments, at principal quantum numbers $n=8--65$ and at three ambient temperatures of 77, 300, and $600\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. A peculiarity of our calculations is that we take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of measured ionization rates and shapes of their dependences on $n$. The calculated ionization rates are compared with the results of our earlier measurements of BBR-induced ionization rates of Na $nS$ and $nD$ Rydberg states with $n=8--20$ at $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. A good agreement for all states except $nS$ with $n>15$ is observed. We also present the useful analytical formulas for the quick estimation of BBR ionization rates of Rydberg atoms.

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I I Beterov, D B Tretyakov, I I Ryabtsev +3 more

We have studied ionization of alkali-metal Rydberg atoms by blackbody radiation (BBR). The results of theoretical calculations of ionization rates of Li, Na, K, Rb and Cs Rydberg atoms are presented. The calculations have been performed for n S, n P and n D states for principal quantum numbers n =8–65 at ambient temperatures of 77, 300 and 600 K. The calculations take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of the measured ionization rates and their n dependence. A Cooper minimum for BBR-induced transitions between bound Rydberg states of Li has been found. The calculated ionization rates are compared with our earlier measurements of BBR-induced ionization rates of Na n S and n D Rydberg states with n =8–20 at 300 K. Good agreement for all states except n S with n >15 is observed. Useful analytical formulae for quick estimates of BBR ionization rates of Rydberg atoms are presented. Application of BBR-induced ionization signal to measurements of collisional ionization rates is demonstrated.We have studied ionization of alkali-metal Rydberg atoms by blackbody radiation (BBR). The results of theoretical calculations of ionization rates of Li, Na, K, Rb and Cs Rydberg atoms are presented. The calculations have been performed for n S, n P and n D states for principal quantum numbers n =8–65 at ambient temperatures of 77, 300 and 600 K. The calculations take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of the measured ionization rates and their n dependence. A Cooper minimum for BBR-induced transitions between bound Rydberg states of Li has been found. The calculated ionization rates are compared with our earlier measurements of BBR-induced ionization rates of Na n S and n D Rydberg states with n =8–20 at 300 K. Good agreement for all states except n S with n >15 is observed. Useful analytical formulae for quick estimates of BBR ionization rates of Rydberg atoms are presented. Application of BBR-induced ionization signal to measurements of collisional ionization rates is demonstrated.

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Effects of blackbody radiation on highly excited atoms

William E. Cooke, Thomas F. Gallagher

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Physical Review AFeb 1, 1980143 citations

Ionization of Rydberg atoms by blackbody radiation

Ilya I. Beterov, Denis B. Tretyakov, I. I. Ryabtsev +3 more

We have studied ionization of alkali-metal Rydberg atoms by blackbody radiation (BBR). The results of theoretical calculations of ionization rates of Li, Na, K, Rb and Cs Rydberg atoms are presented. The calculations have been performed for nS, nP and nD states for principal quantum numbers n=8-65 at ambient temperatures of 77, 300 and 600 K. The calculations take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of the measured ionization rates and their n-dependence. A Cooper minimum for BBR-induced transitions between bound Rydberg states of Li has been found. The calculated ionization rates are compared with our earlier measurements of BBR-induced ionization rates of Na nS and nD Rydberg states with n=8-20 at 300 K. A good agreement for all states except nS with n> 15 is observed. Useful analytical formulas for quick estimates of BBR ionization rates of Rydberg atoms are presented. Application of BBR-induced ionization signal toWe have studied ionization of alkali-metal Rydberg atoms by blackbody radiation (BBR). The results of theoretical calculations of ionization rates of Li, Na, K, Rb and Cs Rydberg atoms are presented. The calculations have been performed for nS, nP and nD states for principal quantum numbers n=8-65 at ambient temperatures of 77, 300 and 600 K. The calculations take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of the measured ionization rates and their n-dependence. A Cooper minimum for BBR-induced transitions between bound Rydberg states of Li has been found. The calculated ionization rates are compared with our earlier measurements of BBR-induced ionization rates of Na nS and nD Rydberg states with n=8-20 at 300 K. A good agreement for all states except nS with n> 15 is observed. Useful analytical formulas for quick estimates of BBR ionization rates of Rydberg atoms are presented. Application of BBR-induced ionization signal to

Nov 26, 201255 citations

{\mathrm{n}}_{\mathrm{i}}^{\mathrm{*}}

=24--29), repopulation times (

{\mathrm{t}}_{\mathrm{d}}

=0--50 \ensuremath{\mu}s), and fields (

{\mathrm{F}}_{\mathrm{s}}

{\mathrm{F}}_{\mathrm{s}}

=200 V/cm we were able to identify the populated states. Comparisons with calculations in H reveal that these resonances are hydrogenic.

T=300

K. Contributions from the entire blackbody spectrum and from both discrete and continuous perturbing states are included. The accuracy is considerably greater than that of previous estimates.

Results of theoretical calculations of ionization rates of Rb and Na Rydberg atoms by blackbody radiation (BBR) are presented. Calculations have been performed for

nS

nP

, and

nD

states of Na and Rb, which are commonly used in a variety of experiments, at principal quantum numbers

n=8--65

and at three ambient temperatures of 77, 300, and

600\phantom{\rule{0.3em}{0ex}}\mathrm{K}

. A peculiarity of our calculations is that we take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of measured ionization rates and shapes of their dependences on

n

. The calculated ionization rates are compared with the results of our earlier measurements of BBR-induced ionization rates of Na

nS

and

nD

Rydberg states with

n=8--20

300\phantom{\rule{0.3em}{0ex}}\mathrm{K}

. A good agreement for all states except

nS

with

n>15

is observed. We also present the useful analytical formulas for the quick estimation of BBR ionization rates of Rydberg atoms.

T=0

values. In addition, the 300-K blackbody field of \ensuremath{\sim}10 V/cm produces ac Stark shifts of the Rydberg levels. Calculations of the population redistribution effects and ac Stark shifts are presented. Examples are given to illustrate that care must be taken in experiments with highly excited atoms to ensure that only one state is being observed rather than a distribution.