Spectroscopic Investigation of the Odd-Parity 3d 2 D → nf 2 F Transitions of Neutral Sodium

Nadeem, Ali; Shah, M.; Shahzada, Shaista; Ahmed, Mushtaq; Haq, Sami Ul

doi:10.1007/s10812-015-0170-4

Cited by 3 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One problem to efficiently excite the Rydberg P states might be their small transition probability. Other authors did not observe higher order transitions into the P-Rydberg states originating from the 3 2 D states 39 , 40 . Instead, the Rydberg P states are significantly weaker than the reported F states 40 , which are nicely resolved in ionization experiments.…”

Section: Discussionmentioning

confidence: 89%

Two Step Excitation in Hot Atomic Sodium Vapor

Docters

Wrachtrup

Gerhardt

2017

Sci Rep

View full text Add to dashboard Cite

A two step excitation scheme in hot atomic sodium vapor is experimentally investigated. The observed effects reflect a coupling between the 32S, 32P and the 32D states. We present the relative dependence on detuning of the two utilized lasers around λ = 589 nm and 819 nm. Unlike expected, we achieve a higher detuning dependence of the probe and the coupling laser by a factor of approximately three. The presented work aimed for a Rydberg excitation and quantum light storage. Such schemes are usually implemented with a red laser on the D-line transition and a coupling laser of shorter (typically blue) wavelength. Due to the fact that higher P-Rydberg states are approximately two times higher in energy than the 32D state, a two photon transition from the atomic excited 32P state to a Rydberg P state is feasible. This might circumvent laser frequency doubling whereby only two lasers might mediate a three photon process. The scheme of adding three k-vectors allows for electromagnetically induced transparency experiments in which the resulting k-vector can be effectively reduced to zero. By measurements utilizing electric fields and an analysis of the emission spectrum of the atomic vapor, we can exclude the excitation of the P-P two photon transition.

show abstract

Section: Discussionmentioning

confidence: 89%

Two Step Excitation in Hot Atomic Sodium Vapor

Docters

Wrachtrup

Gerhardt

2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Mohler et al [10] used a thermionic diode as a detector for the first time in spectroscopy. Since the early 1970s, after the availability of tunable dye lasers, the thermionic diode became a powerful tool for laser spectroscopy, and extensive research work has been carried out [5,7,[11][12][13][14][15]. For laser spectroscopy, the spacechargebased thermionic diode is not an ordinary iondetector in the sense that the signal current arises from the manifold due to spacecharge neutralization effects by the positive ions created.…”

Section: Introductionmentioning

confidence: 99%

Development of a thermionic diode detector for laser spectroscopy

Saini

Kumar

Dixit

2019

Meas. Sci. Technol.

View full text Add to dashboard Cite

This paper presents work on the development of a thermionic diode detector for laser spectroscopy of atoms. Basically, this is a positive ion-detector that exploits the negative space charge accumulated around the cathode of a diode. In this device, a thin and straight hot cathode wire is stretched axially into a long cylindrical heat-pipe that constitutes a device similar to an electronic vacuum diode. The ions in the diode space-charge region are produced as a result of photoionization or collisional ionization of lithium atoms. The design aspects and measurement of its electrical characteristics are described. A new method based on the resonant photoionization of lithium is used to measure the gain of the ion-detector. An application is also demonstrated to measure the photoionization cross-section (σ = 7.8 ± 1.6 Mb) of lithium near its first ionization threshold for two-photon excitation at 639.145 nm. Important features of the thermionic diode are its easy, versatile and sturdy design with high gain (104) and sensitivity that make it a valuable and cost-effective tool for spectroscopists.

show abstract