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Volz, U; Majerus, M.; Liebel, H; Schmitt, A.; Schmoranzer, H.

doi:10.1103/physrevlett.76.2862

Cited by 100 publications

(65 citation statements)

References 16 publications

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“…7 and 8, we plot W ν as a function of wavelength for a number of ro-vibrational levels for sodium and potassium, respectively. The corresponding radiative lifetimes are listed in Tables II and III. They do not differ much from the lifetimes of the excited atoms, 16.3 ns for Na [14,15] and 26.5 ns for K [16], into which the A 2 Π states of the molecules separate with the exception of the v = 4 level of KHe. For the v = 4 level of KHe there occurs what appears to be a chance cancellation in the integration of the dipole matrix element.…”

Section: Resultsmentioning

confidence: 96%

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms

2006

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We perform fully quantum mechanical calculations in the binary approximation of the emission and absorption profiles of the sodium 3s-3p and potassium 4s-4p resonance lines under the influence of a helium perturbing gas. We use carefully constructed potential energy surfaces and transition dipole moments to compute the emission and absorption coefficients at temperatures from 158 to 3000 K. Contributions from quasi-bound states are included. The resulting red and blue wing profiles agree well with previous theoretical calculations and with experimental measurements.

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Section: Resultsmentioning

confidence: 96%

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms

2006

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“…For a long time, it was not possible to experimentally check whether the relation (2.1) is exact or approximate, since the lifetime and width could not be measured in the same system. This changed with the measurements of the width [31] and lifetime [32] of the 3p 2 P 3/2 state of Na, which provide a firm experimental basis that Eq. (2.1) holds exactly, not just approximately.…”

Section: Basics Of Resonances and Gamow Statesmentioning

confidence: 99%

The resonance amplitude associated with the Gamow states

Madrid

2008

Nuclear Physics A

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The Gamow states describe the quasinormal modes of quantum systems. It is shown that the resonance amplitude associated with the Gamow states is given by the complex delta function. It is also shown that under the near-resonance approximation of neglecting the lower bound of the energy, such resonance amplitude becomes the Breit-Wigner amplitude. This result establishes the precise connection between the Gamow states, Nakanishi's complex delta function and the Breit-Wigner amplitude. In addition, this result provides another theoretical basis for the phenomenological fact that the almost-Lorentzian peaks in cross sections are produced by intermediate, unstable particles.

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“…However, as that reference discusses, while an earlier study obtained a very small uncertainty in the Cs 6P 3/2 lifetime of 0.01% [27], a later re-analysis of the same data set resulted in an uncertainty of 1% [28] necessitating the need for further measurements. Other techniques such as beam-gas laser spectroscopy [29] and high precision linewidth measurements [30] have also achieved low uncertainty lifetime measurements in other atoms. Using the technique described in this paper, we obtain a lifetime value of 30.462(46) ns, which allows a comparison between theory and experiment approaching the 0.1% level in Cs.…”

Section: Introductionmentioning

confidence: 99%

Lifetime measurement of the cesium6P3/2level using ultrafast pump-probe laser pulses

et al. 2015

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Using the inherent timing stability of pulses from a mode-locked laser, we have precisely measured the cesium 6P 3/2 excited state lifetime. An initial pump pulse excites cesium atoms in two counterpropagating atomic beams to the 6P 3/2 level. A subsequent synchronized probe pulse ionizes atoms which remain in the excited state, and the photo-ions are collected and counted. By selecting pump pulses which vary in time with respect to the probe pulses, we obtain a sampling of the excited state population in time, resulting in a lifetime value of 30.462(46) ns. The measurement uncertainty (0.15%) is slightly larger than our previous report of 0.12% [Phys. Rev. A 84, 010501(R) (2011)] due to the inclusion of additional data and systematic errors. In this follow-up paper we present details of the primary systematic errors encountered in the measurement, which include atomic motion within the intensity profiles of the laser beams, quantum beating in the photo-ion signal, and radiation trapping. Improvements to further reduce the experimental uncertainty are also discussed.

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Precision Lifetime Measurements onNaI3p2P1/2

Cited by 100 publications

References 16 publications

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms

The resonance amplitude associated with the Gamow states

Lifetime measurement of the cesium6P3/2level using ultrafast pump-probe laser pulses

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