The stimulated emission signal from a tunable cavity with Rydberg matter as the lasing medium is studied. The Rydberg matter is excited by heating through a non-radiative process. The emission bands are resolved by diffraction up to the fifth order using several different gratings in the cavity. The signal variation with wavelength is strong, especially in the wavelength range <2000 nm. The wavelength variation of the signal over the range 800–14 000 nm is compared with Rydberg matter theory giving good agreement. The transitions observed are from down to 6–21. There are no bands in the visible range, which is explained from the possible excitation levels in Rydberg matter. Reflecting some light out of the cavity gives lower gain (higher loss) and sharper bands, demonstrating that the device is indeed a working laser.The stimulated emission signal from a tunable cavity with Rydberg matter as the lasing medium is studied. The Rydberg matter is excited by heating through a non-radiative process. The emission bands are resolved by diffraction up to the fifth order using several different gratings in the cavity. The signal variation with wavelength is strong, especially in the wavelength range <2000 nm. The wavelength variation of the signal over the range 800–14 000 nm is compared with Rydberg matter theory giving good agreement. The transitions observed are from down to 6–21. There are no bands in the visible range, which is explained from the possible excitation levels in Rydberg matter. Reflecting some light out of the cavity gives lower gain (higher loss) and sharper bands, demonstrating that the device is indeed a working laser.

Journal of Physics B Atomic Molecular and Optical PhysicsDec 17, 200335 citations

XeKrの高リュードベリ状態におけるイオンコアスイッチング

祐仁福田, Tamás Szidarovszky, 昌生中田 +3 more

The OODR mass spectroscopy is applied to investigate dynamical properties of Xe**Kr in high Rydberg states. It is found that two dissociation pathways producing both the Xe** and Kr** fragments compete, where the ion core of high Rydberg molecule switches. It is revealed that ion-core switching (ICS) occurs because of the interaction between bound potentials of high Rydberg states Xe**Kr and a repulsive potential of XeKr**. Moreover, the observed variation in ICS ratio is explained by the population transfer from high Rydberg states of Xe**Kr of the A ion core to those of the X ion-core.The OODR mass spectroscopy is applied to investigate dynamical properties of Xe**Kr in high Rydberg states. It is found that two dissociation pathways producing both the Xe** and Kr** fragments compete, where the ion core of high Rydberg molecule switches. It is revealed that ion-core switching (ICS) occurs because of the interaction between bound potentials of high Rydberg states Xe**Kr and a repulsive potential of XeKr**. Moreover, the observed variation in ICS ratio is explained by the population transfer from high Rydberg states of Xe**Kr of the A ion core to those of the X ion-core.

Sep 14, 20160 citations

Indirect spin-orbit interaction in high- L Rydberg states with 2S1/2 cores

Erica L. Snow, R. A. Komara, M. A. Gearba +1 more

In high- $L$ Rydberg states, where exchange interactions are of negligible size, spin-orbit interactions are expected to determine the energy differences between states of different spin orientations. This is well studied in the case of helium, where it results in a fourfold splitting of each high- $L$ term, coming from the two electrons' spin-orbit interactions. A similar structure might be expected in heavier Rydberg states, whose core ion is a ${}^{2}{S}_{1/2}$ state. However, observations in barium Rydberg states and recent observations in Rydberg states of ${\mathrm{Si}}^{2+}$ reveal significant deviations from this expectation. Both can be explained as an indirect effect of spin-orbit interactions in virtual excitations of the core ion. A perturbative treatment predicts an indirect spin-orbit interaction for the Rydberg state proportional to the inverse sixth power of the Rydberg electron's radial coordinate. The significance of this term, relative to the direct magnetic interactions, varies by more than six orders of magnitude between the three systems studied, helium, ${\mathrm{Si}}^{2+},$ and barium.In high-$L$ Rydberg states, where exchange interactions are of negligible size, spin-orbit interactions are expected to determine the energy differences between states of different spin orientations. This is well studied in the case of helium, where it results in a fourfold splitting of each high-$L$ term, coming from the two electrons' spin-orbit interactions. A similar structure might be expected in heavier Rydberg states, whose core ion is a ${}^{2}{S}_{1/2}$ state. However, observations in barium Rydberg states and recent observations in Rydberg states of ${\mathrm{Si}}^{2+}$ reveal significant deviations from this expectation. Both can be explained as an indirect effect of spin-orbit interactions in virtual excitations of the core ion. A perturbative treatment predicts an indirect spin-orbit interaction for the Rydberg state proportional to the inverse sixth power of the Rydberg electron's radial coordinate. The significance of this term, relative to the direct magnetic interactions, varies by more than six orders of magnitude between the three systems studied, helium, ${\mathrm{Si}}^{2+},$ and barium.

Physical Review AAug 29, 200316 citations

Experimental studies of the interaction of Rydberg atoms with charged particles

J. F. Delpech

Jan 1, 19831 citation

In high-

L

Rydberg states, where exchange interactions are of negligible size, spin-orbit interactions are expected to determine the energy differences between states of different spin orientations. This is well studied in the case of helium, where it results in a fourfold splitting of each high-

L

term, coming from the two electrons' spin-orbit interactions. A similar structure might be expected in heavier Rydberg states, whose core ion is a

{}^{2}{S}_{1/2}

state. However, observations in barium Rydberg states and recent observations in Rydberg states of

{\mathrm{Si}}^{2+}

reveal significant deviations from this expectation. Both can be explained as an indirect effect of spin-orbit interactions in virtual excitations of the core ion. A perturbative treatment predicts an indirect spin-orbit interaction for the Rydberg state proportional to the inverse sixth power of the Rydberg electron's radial coordinate. The significance of this term, relative to the direct magnetic interactions, varies by more than six orders of magnitude between the three systems studied, helium,

{\mathrm{Si}}^{2+},

and barium.