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Bulletin of the American Physical Society

Detection of Rydberg States of Helium by Black Body Ionization

Xiaoxu Lu, Yuan Sun, Harold J. Metcalf

Published Jun 16, 2011• 0 citations
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Spectroscopy of atoms in Rydberg states was an object of extensive investigation (see for example [1-5] and references therein). Usually necessary population of Rydberg states is achieved by means of multi-stage pulse laser pumping. That is why useful signal of ionization current from Single Channel Electron Multiplier (CEM or channeltron) is also pulse signal. Essential temporal instability of this signal is one of the main problems during its registration. More over in order to investigate Rydberg spectra of elements with high value of ionization potential (Al, Cu, Au etc.) it is necessary to apply high-temperature source of atoms (up to 2000 3000K). That is why there appears effect of redistribution of population by means of black body radiation. This effect makes additional difficulties to study ionization spectra. In order to overcome these obstacles we propose to apply time-dependent registration of ionization current from CEM. First of all such approach will allow us to store individual time-dependent realizations and to provide averaging of these realizations numerically excluding temporal instability. In addition after improvement of the receiving system it will be possible to detect ionization spectra resolving Rydberg states populated by means of black body radiation.

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Diffusion ionization of Rydberg atoms due to black-body radiation

B. P. Kaulakis

It was only recently established that the ubiquitous black-body radiation plays an important role in the spectroscopy of Rydberg atoms even at room temperature. 1.2 Black-body radiation causes shifts in the energy of atomic levels,2 induces transitions between atomic states,2 causes photoionization of Rydberg atoms,3 and affects the population of highly excited states in the recombination of ions.4•5 We will show that black-body radiation also causes diffusive ionization of Rydberg atoms and ions. Under certain conditions, the principal condition among which is the collision-induced mixing of levels in I, the diffusion process resulting from black-body radiation is the basic mechanism for the ionization of Rydberg atoms.

JETPL•Mar 1, 1988•1 citation
Spectroscopy of atoms in Rydberg states was an object of extensive investigation (see for example [1-5] and references therein). Usually necessary population of Rydberg states is achieved by means of multi-stage pulse laser pumping. That is why useful signal of ionization current from Single Channel Electron Multiplier (CEM or channeltron) is also pulse signal. Essential temporal instability of this signal is one of the main problems during its registration. More over in order to investigate Rydberg spectra of elements with high value of ionization potential (Al, Cu, Au etc.) it is necessary to apply high-temperature source of atoms (up to 2000 3000K). That is why there appears effect of redistribution of population by means of black body radiation. This effect makes additional difficulties to study ionization spectra. In order to overcome these obstacles we propose to apply time-dependent registration of ionization current from CEM. First of all such approach will allow us to store individual time-dependent realizations and to provide averaging of these realizations numerically excluding temporal instability. In addition after improvement of the receiving system it will be possible to detect ionization spectra resolving Rydberg states populated by means of black body radiation.
It was only recently established that the ubiquitous black-body radiation plays an important role in the spectroscopy of Rydberg atoms even at room temperature. 1.2 Black-body radiation causes shifts in the energy of atomic levels,2 induces transitions between atomic states,2 causes photoionization of Rydberg atoms,3 and affects the population of highly excited states in the recombination of ions.4•5 We will show that black-body radiation also causes diffusive ionization of Rydberg atoms and ions. Under certain conditions, the principal condition among which is the collision-induced mixing of levels in I, the diffusion process resulting from black-body radiation is the basic mechanism for the ionization of Rydberg atoms.