Two-photon laser spectroscopy of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>ns</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="script">’</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>nd</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="script">’</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>autoionizing Rydbe

Wang, Liang‐Guo; Knight, R. D.

doi:10.1103/physreva.34.3902

Cited by 46 publications

(24 citation statements)

References 12 publications

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“…The ␦ parameters for the 2 P 1/2 ndЈ͓3/2͔ 2 and the 2 P 1/2 ndЈ͓5/ 2] 2,3 states were taken to be identical to those for 2 P 1/2 ndЈ͓3/2͔ 1 ͓point ͑i͔͒. The ⌫ 0 parameters for the ndЈ Jϭ2 and Jϭ3 states of Ar were inferred on the basis of point ͑iv͒ from the experimental ⌫ 0 data for Xe, 6 which were scaled by the numerical factor of 0.89. The quantum defect for the 2 P 1/2 n f Ј͓5/2͔ 2 series was taken from absorption ͑quadrupole͒ spectroscopy, 63 while ⌫ 0 , which is expected to be small for these weakly penetrating orbitals, was roughly estimated from the Rydberg spectroscopy of NO 15,16 to be ⌫ 0 ( f Ј)Շ100 cm Ϫ1 .…”

Section: A Input Datamentioning

confidence: 99%

“…Even for the extensively studied Xe atom these parameters, well known for the nsЈ states, 64 are unknown for the npЈ states and are known within uncertainty of Ϯ30% for the ndЈ states. 6 Thus the theoretical hunting ground is, at present, limited due to lack of input information for the construction of the effective Hamiltonian. Regarding our numerical procedure, we had diagonalized the effective Hamiltonian for a single n manifold.…”

Section: Theory Experiment and Perspectivesmentioning

confidence: 99%

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The dynamics of high autoionizing Rydberg states of Ar

Bixon

Jortner

1995

The Journal of Chemical Physics

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In this paper we present a theoretical study of the autoionization dynamics of high 2 P 1/2 npЈ͓3/2͔ 1 Rydbergs ͑with the principal quantum numbers nϭ100 -280͒ of Ar in weak homogeneous electric fields ͑Fϭ0.01 -1.0 V/cm͒, which were experimentally interrogated by time-resolved zero-electron kinetic energy ͑ZEKE͒ spectroscopy ͓M. Mühlpfordt and U. Even, J. Chem. Phys. 103, 4427 ͑1995͔͒, and which exhibit a marked dilution ͑i.e., ϳ2 orders of magnitude lengthening͒ of the lifetimes relative to those inferred on the basis of the n 3 scaling law for the spectral linewidths of the npЈ (nϭ12 -24) Rydbergs. The multichannel effective Hamiltonian ͑H eff ͒ with several doorway state͑s͒ ͑for excitation and decay͒ and pure escape states ͑for decay͒ was advanced and utilized to treat the dynamics of the mixed Stark manifold of the ZEKE Rydbergs. H eff of dimension 2nϪ1 is then constructed for a n Rydberg manifold using independent experimental information on the ͑l dependent͒ quantum defects ␦(l) and the ͑l, K, J dependent͒ decay widths, which are of the form ⌫ 0 (lKJ)/"nϪ␦(l͒… 3 , with ⌫ 0 (lKJ) being the decay widths constants. Here, l, K, and J are the azimuthal, the electronic and the total electronic angular momentum quantum numbers, respectively. Two coupling ranges are distinguished according to the strength of the reduced electric field F(n, pЈ)ϭ(F/V cm Ϫ1 ͒n 5 / 3.4ϫ10 9 [␦(pЈ)͑mod1͔͒. Range ͑A͒; The onset of the effective coupling of the doorway and escape states, i.e., 0.7рF(n,pЈ)р2. Range ͑B͒; The strong mixing domain F(n, pЈ)у3. The lifetimes in range ͑B͒ can be well represented by a nearly democratic mixing of all the doorway and escape states (lKJ), with the average valueIn range ͑B͒ ͗(n)͘ increases with increasing n and is only weakly F dependent. Range ͑A͒ is characterized by a hierarchy of two time scales for the decay, with a short decay component, which manifests the residue of the doorway state, and a distribution of very long lifetimes with an average value ͗ LONG (n)͘Ӎ(n)͗ SM (n)͘, where (n)Ӎ2 -5. In range ͑A͒, ͗ LONG (n)͘ decreases with increasing n and decreases with increasing F, manifesting the enhancement of mixing. We identified range ͑B͒ for nϭ150 -280, where a semiquantitative agreement between the experimental ZEKE lifetimes and spectra and our theory was obtained. A tentative identification of range ͑A͒ for lower n ͑ϭ100-150͒ values was accomplished. We have also performed a theoretical study of the Ar autoionization dynamics via the 2 P 1/2 ndЈ͓3/2͔ 1 doorway state, which was experimentally studied by Merkt ͓J. Chem. Phys. 100, 2623 ͑1994͔͒. The onset of range ͑A͒ was identified in the region nϭ70 -80, with the estimated lifetimes near the onset being in agreement with experiment. Our analysis explains the higher n onset for the npЈ doorway state mixing ͑nӍ100 and FӍ0.1 V/cm͒ than for the npЈ doorway state mixing ͑nЈϭ70 -80 for FӍ0.1 V/cm͒. Experimental values of ͗ LONG (n)͘ ͑around nӍ90͒ in range ͑A͒, excited via the 2 P 1/2 ndЈ͓3/2͔ 1 doorway state, are considerably longer than those predi...

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Section: A Input Datamentioning

confidence: 99%

Section: Theory Experiment and Perspectivesmentioning

confidence: 99%

The dynamics of high autoionizing Rydberg states of Ar

Bixon

Jortner

1995

The Journal of Chemical Physics

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“…Without lasers, the photoelectron detector registers a very weak background signal, which is negligible (background signals will be (4) since F 2 -F2L is the part of F 2 depleted by photoionization. Therefore, as mentioned above, we obtain for 72:…”

Section: Y = a Z S / A~ ~mentioning

confidence: 99%

“…Reactions of metastable rare gas atoms Rg* with photons, electrons, atoms, molecules, and surfaces are ac-* Dedicated to Prof. Dr. Wilhelm Hanle on the occasion of his 90th birthday "~" Present address: Fysisk Laboratorium, H.C. Orsted Institutet, DK-2100 Copenhagen, Denmark *'~ Permanent address: Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, 80309-0440, USA tively studied by molecular beam techniques [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Absolute detection of metastable rare gas atoms by a cw laser photoionization method

Schohl

Klar

Kraft

et al. 1991

Z Phys D - Atoms, Molecules and Clusters

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract. A novel, accurate method tbr the absolute detection of metastable rare gas atoms is described and demonstrated. It involves a direct in situ determination of the electron emission coefficient ? for impact of the respective metastable atom on a conducting surface, y is reliably obtained by a cw two-photon ionization -depletion technique: the reduction A I s in electron current from the detector surface due to efficient photoionization removal of the metastable flux is compared with the photoelectron current A I p ( y = A I s / A I e ) . The principle of the method, possible realization schemes for the different metastable rare gas atoms and the apparatus are described in detail. The method has been applied so far to metastable Ne* (3s 3P2), Ar* (4s 3P2), and Kr* (5s 3P2) atoms, and corresponding results for y, obtained with five different chemically clean, polycrystalline surface materials and at two surface temperatures (300 K, 360 K) are reported. Whereas for Ne*, the value of y (~0.35) showed only a rather weak dependence on the surface material and temperature (as also found for a mixed He* (23S, 21S) beam), strong variations in ?, especially at 300 K, were detected for Ar* and Kr* (values between 0.25 and 0.003). Some applications of the described method, especially with regard to the determination of absolute reaction cross sections involving metastable rare gas atoms, are discussed.

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“….np 6 , 1 S 0 ground state to the odd parity ( 2 P o 1/2 )ns and ( 2 P o 1/2 )nd states with J = 1. With the development of laser sources, transitions to these states, as well as to those forbidden in single-photon transitions from the ground state, have also been studied by using multiphoton and multistep excitation [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Photoelectron imaging of autoionizing states of xenon: Effect of external electric fields

Shubert

Pratt

2011

Phys. Rev. A

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Velocity map photoelectron imaging was used to study the photoelectron angular distributions of autoionizing Stark states of atomic xenon excited just below the Xe + 2 P o 1/2 threshold at fields ranging from 50 to 700 V/cm. Two-color, two-photon resonant, three-photon excitation via the 6p [1/2] 0 level was used to probe the region of interest. The wavelength scans show a similar evolution of structure to that observed in single-photon excitation [Ernst et al., Phys. Rev. A 37, 4172 (1988)]. The photoelectron angular distributions following autoionization of the Stark states provide information on the decay of excited states in electron fields. In the present experiments, the large autoionization width of the ( 2 P o 1/2 )nd[3/2] o 1 series dominates the decay processes, and thus controls the angular distributions. However, the angular distributions of the Stark states also indicate the presence of other decay channels contributing to the decay of these states.

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Two-photon laser spectroscopy of thens’andnd’autoionizing Rydbe

Cited by 46 publications

References 12 publications

The dynamics of high autoionizing Rydberg states of Ar

The dynamics of high autoionizing Rydberg states of Ar

Absolute detection of metastable rare gas atoms by a cw laser photoionization method

Photoelectron imaging of autoionizing states of xenon: Effect of external electric fields

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