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Haq, Sami Ul; Kalyar, M. A.; Rafiq, Muhammad; Ali, Raheel; Piracha, Naveed K.; Baig, M. A.

doi:10.1103/physreva.79.042502

Cited by 11 publications

(7 citation statements)

References 40 publications

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“…The rate equations involving the number densities in the ground state, excited state, and the ionization channels have been solved to derive a relation for the number of ions produced as a function of the intensity of the ionizing laser. This method was originally suggested by Ambartzumian et al [30] and Heinzmann et al [31] and has been used and described by a number of researchers [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]; it has been extensively used for the measurement of photoionization cross sections of lithium isotopes [20][21][22] and of the excited states of alkali-metal and alkaline earth metals [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Saturation is explained by the fact that as the intensity of the ionizing laser is increased, the ion signal keeps on increasing until the point at which any further increase in the ionizing laser intensity will not increase the ion signal.…”

Section: Resultsmentioning

confidence: 99%

“…In our present work we have validated experimentally the theoretically predicted Cooper minimum in the photoionization cross sections of the 7s 2 S 1/2 excited state of potassium. This work is in continuation of our experimental studies [18][19][20][21][22][23][24][25][26][27][28][29] on the measurements of the photoionization cross sections for the excited states of alkali-metal and alkaline atoms. We report here the measurements of the photoionization cross sections from the 7s 2 S 1/2 excited state of potassium at four different ionizing lasers wavelengths, about 3 eV above the first ionization threshold using the two-step photoionization saturation techniques in conjunction with a time-of-flight (TOF) mass spectrometer.…”

Section: Introductionmentioning

confidence: 95%

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Evidence of a Cooper minimum in the photoionization from the7s2S1/2excited state of potassium

2013

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The existence of a Cooper minimum in the experimentally measured photoionization cross sections for the 7s 2 S 1/2 excited state of potassium has been reported using a two-step laser excitation technique in conjunction with a time-of-flight mass spectrometer. The photoionization cross sections for the 7s 2 S 1/2 state have been determined as (9.78 ± 0.01) × 10 −2 , (3.30 ± 0.49) × 10 −4 , (5.47 ± 0.82) × 10 −3 , and (2.06 ± 0.30) × 10 −2 Mb at the ionizing laser wavelengths 1064, 700, 532, and 355 nm, respectively, that validate the presence of a Cooper minimum at ∼ =1.25 eV above the first ionization threshold. The number density has been determined as N 0 = 2 × 10 11 cm −3 .The experimentally determined absolute values of the cross sections are in qualitative agreement with the theoretical predictions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Evidence of a Cooper minimum in the photoionization from the7s2S1/2excited state of potassium

2013

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“…This technique has been widely used for the measurement of the photoionization cross section of the excited states of alkali-metal atoms as well as for alkaline earths [31][32][33][34][35]. For the two-step photoionization process, the solution of the rate equations gives an expression that relates the absolute photoionization cross section at a particular wavelength of the ionizing laser:…”

Section: Resultsmentioning

confidence: 99%

Photoionization from the5p 2P3/2state of rubidium

Nadeem

Haq

2011

Phys. Rev. A

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We report two-step photoionization studies from the 5p 2 P 3/2 excited state of rubidium using two dye lasers simultaneously pumped by a common Nd:YAG laser in conjunction with a thermionic diode ion detector. The photoionization cross section at the first ionization threshold is measured as 18.8 ± 3 Mb and at excess energies of 0.013, 0.106, 0.229, and 0.329 eV is measured as 15, 13.6, 12.6, and 12.5 Mb, respectively. The measured value of the photoionization cross section at the threshold is used to calibrate the oscillator strengths of the 5p 2 P 3/2 → nd 2 D 5/2 (22 n 52) Rydberg transitions.

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“…The optical oscillator strength for the Rydberg transitions of cesium have been determined by the technique developed by Mende and Kock [46] and widely used for alkalis, alkaline earths, and inert gases [47][48][49][50]. A relation is obtained among the f value of a Rydberg transition, the photoionization cross section at threshold, and the wavelength of a particular transition as:…”

Section: Resultsmentioning

confidence: 99%

Photoionization from the 6p2P3/2state of neutral cesium

Haq

Nadeem

2010

Phys. Rev. A

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We report the photoionization studies of cesium from the 6p 2 P 3/2 excited state to measure the photoionization cross section at and above the first ionization threshold, oscillator strength of the highly excited transitions, and extension in the Rydberg series. The photoionization cross section at the first ionization threshold is measured as 25 (4) Mb and at excess energies 0.02, 0.04, 0.07, and 0.09 eV as 21, 19, 17, and 16 Mb, respectively. Oscillator strength of the 6p 2 P 3/2 → nd 2 D 5/2 (23 n 60) Rydberg transitions has been extracted utilizing the threshold value of photoionization cross section and the recorded nd 2 D 5/2 photoionization spectra.

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Oscillator strength measurements of the5s6sS10→5

Cited by 11 publications

References 40 publications

Evidence of a Cooper minimum in the photoionization from the7s2S1/2excited state of potassium

Evidence of a Cooper minimum in the photoionization from the7s2S1/2excited state of potassium

Photoionization from the5p 2P3/2state of rubidium

Photoionization from the 6p2P3/2state of neutral cesium

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