Above-threshold ionization of cesium by 1.9-μm light

Druten, N. J. van; Trainham, R.; Müller, H. G.

doi:10.1103/physreva.51.r898

Cited by 5 publications

(1 citation statement)

References 21 publications

(36 reference statements)

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“…The use of the femtosecond laser at 800 nm usually causes an effective ionization of the cesium vapor. It is worth mentioning that above threshold ionization experiments with cesium atoms [48,49] used short pulse laser centered at 620 and 1908 nm, which correspond to two photon and six photon ionization process very close to a peak at about 310 nm (see figure 6). It is quite possible that in those experiments molecular photoionization was also, at least, slightly involved.…”

Section: Discussionmentioning

confidence: 99%

Structured photoionization continuum of superheated cesium vapor

Pichler

Makdisi

Kokaj

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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We studied the absorption spectrum of dense cesium vapor in an all-sapphire cell with a special emphasis on the highly structured photoionization continuum. This continuum appears to be composed of atomic and molecular contributions which can be separated by means of additional superheating of the cesium vapor in the sapphire cell. This was possible due to the small amount of cesium filling which completely evaporated at a temperature of around 450 °C. This enabled the overheating of cesium dimers which greatly reduced its concentration at a temperature of 900 °C, leaving almost pure atomic Cs vapor. The analysis of the thermal destruction indicated that the highly structured molecular component of the photoionization continuum can be entirely attributed to cesium dimers. We discuss the possible origin of the structured photoionization continuum as stemming from the absorption process from the ground state of the Cs2 molecule to the doubly excited Cs2** molecule located above Cs2+ molecular ionization limit. The corresponding potential curves are subjected to mutual interactions and autoionization.

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Section: Discussionmentioning

confidence: 99%

Structured photoionization continuum of superheated cesium vapor

Pichler

Makdisi

Kokaj

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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Above-threshold ionization in K via a Cooper minimum in the continuum

et al. 1997

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We have measured the energy spectra of electrons resulting from the ionization of K using high-intensity (2ϫ10 12 W/cm 2 ) nanosecond laser pulses at 266 nm. At this wavelength, the energy of one photon is enough to ionize the atom, but the single-photon excitation is suppressed by a Cooper minimum in the ionization cross section. Little direct ionization is observed but, interestingly, a substantial amount of above-threshold ionization ͑ATI͒ is detected. The experimental results show that the atom can absorb up to three photons even though the one-photon channel is directly in the continuum. We have calculated the perturbed wave function of the intermediate state at the one-photon level during the laser pulse and discuss what the radial dependence of the wave function implies for the relative strength of the direct and ATI ionization channels. We have also repeated the experiment using femtosecond laser pulses having focused peak intensities near 2ϫ10 14 W/cm 2 .

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Effect of laser polarization on x-ray emission fromArn(n=200–10
Kumarappan
¹
,
Krishnamurthy
²
,
Mathur
³

et al. 2001
Phys. Rev. A
51
3
23
0
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Above-threshold ionization of cesium by 1.9-μm light

Cited by 5 publications

References 21 publications

Structured photoionization continuum of superheated cesium vapor

Structured photoionization continuum of superheated cesium vapor

Above-threshold ionization in K via a Cooper minimum in the continuum

Effect of laser polarization on x-ray emission fromArn(n=200–10
Kumarappan
¹
,
Krishnamurthy
²
,
Mathur
³

et al. 2001
Phys. Rev. A
51
3
23
0
View full text Add to dashboard Cite

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Above-threshold ionization of cesium by 1.9-μm light

Cited by 5 publications

References 21 publications

Structured photoionization continuum of superheated cesium vapor

Structured photoionization continuum of superheated cesium vapor

Above-threshold ionization in K via a Cooper minimum in the continuum

Effect of laser polarization on x-ray emission fromArn(n=200–10Kumarappan1, Krishnamurthy2, Mathur3 et al. 2001Phys. Rev. A513230View full textAdd to dashboardCite

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Effect of laser polarization on x-ray emission fromArn(n=200–10
Kumarappan
¹
,
Krishnamurthy
²
,
Mathur
³

et al. 2001
Phys. Rev. A
51
3
23
0
View full text Add to dashboard Cite