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Comtet, G.; Harvey, Carol J.; Stewart, J. E.; Bryant, H. C.; Butterfield, K. B.; Clark, David; Donahue, J. B.; Gram, P. A. M.; MacArthur, D.W.; Yuan, V. W.; Smíth, W. W.; Cohen, S.

doi:10.1103/physreva.35.1547

Cited by 24 publications

(6 citation statements)

References 16 publications

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“…We should also mention that the uncertainties in their electric-field strengths are of 17% (Ref. [5]). Figure 3 and Y. K. HO AND J. CAI.…”

Section: Theory and Calculationsmentioning

confidence: 99%

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Electric-field effects on theN=31Po
Yk
¹
,
Callaway
²

1994
Phys. Rev. A
19
1
8
0
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Electric-field effects on the N =3 'P'(1) resonance of H are investigated theoretically using a method of complex-coordinate rotation. Products of Slater orbitals are used to represent the two-electron wave functions with 1,"=5employed for individual electrons. Block matrices with up to L, "=6are used. Convergence behavior for the resonance parameters is examined by using different values of L,"and l,". Results for the energy position and width of the N =3 'P'(1) resonance under the influence of external electric fields are compared with experimental observations. PACS number(s): 32.80.Dz, 32.60.+i

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“…We should also mention that the uncertainties in their electric-field strengths are of 17% (Ref. [5]). Figure 3 and Y. K. HO AND J. CAI.…”

Section: Theory and Calculationsmentioning

confidence: 99%

“…On the experimental side, the field effects on the N =2 Feshbach and shape resonances were performed with field strengths of up to 1.2 MV/cm [5]. In addition, field effects on the N=3'P' state were observed [6], as well as an investigation of the field effects on the 'P' states associated with other high excitation thresholds [7].…”

Section: Introductionmentioning

confidence: 99%

Electric-field effects on theN=31Po
Yk
¹
,
Callaway
²

1994
Phys. Rev. A
19
1
8
0
View full text Add to dashboard Cite

show abstract

“…27 In deed it ap peared to us that the shape res o nance might be come slightly nar rower under small fields. 28 The sta bil ity of the shape res o nance un der strong elec tric fields has been dis cussed the o ret i cally as well. 29,30 We were pleas antly sur prised that the split ting of the Feshbach res o nance could be de scribed quite well by a simple model of mix ing zero-field S and P ionic states, where the en er gies were treated as com plex.…”

Section: A Tale Of Two Res O Nancesmentioning

confidence: 99%

An Experimentalist's View of the H⁻ Ion

Bryant

2001

J Chinese Chemical Soc

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We present a short survey of selected experimental studies of the negative ion of hydrogen over the past twenty‐three years at the 800 MeV linear accelerator at Los Alamos. Experimental techniques are described and heuristic models are used to explain and motivate experimental results. We discuss the first observations of the 1P resonances just below n = 2, the so‐called “Feshbach” and “shape” resonances, seen in photodetachment. As one experimental question is answered, another question becomes exposed, for example, the effects of electric fields on the spectroscopy of the ion. Techniques used to convert the H− ion into a dual‐beam interferometer moving near the speed of light are described. Experimental data taken near thresh old in an electric field are displayed on a universal plot. Multiphoton detachment extends the spectroscopy of the ion to singlet states that would be unreachable by single photodetachment processes. A thin foil also is used to probe the ion structure. Using ion beams in the 35 kV range, 2‐photon measurements of an isotope shift between Hand D− reveal two‐electron correlation consequences. Finally we ad dress the question, “Why has the shape resonance not been seen in astrophysical observations?

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“…We have chosen to study states with N 2, n > 5, where the field strengths and resolution available are sufficient to observe the electric-field effects. Photoexcitation of H ÿ has previously been studied in an electric field both experimentally and theoretically; see, for example, Halka et al [14], Comtet et al [15], and the review of the experimental work of Bryant et al [16]. Despite being isoelectronic, the case of helium is very different from that of H ÿ , where the spectrum is dominated more by Feshbach resonances.…”

mentioning

confidence: 95%

Double Photoexcitation of Helium in a Strong dc Electric Field

et al. 2003

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We report the first experimental measurements of the effect of an applied field on the photoexcitation and autoionization of doubly excited states of helium. Ground-state photoionization spectra have been measured in the region below the He+(N=2) threshold with static electric fields of up to 84.4 kV/cm across the interaction region. The results are compared to the theoretical calculations of Chung et al. [J. Phys. B 34, 165 (2001)]], which are the only calculations available in this regime. Transitions to several states in the N=2, n=6 manifold are assigned, and a wealth of new structure is observed. Our data show that many more series are mixed in by the field than those predicted by theory.

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Stability of theo1shape resonance in

Cited by 24 publications

References 16 publications

Electric-field effects on theN=31Po
Yk
¹
,
Callaway
²

1994
Phys. Rev. A
19
1
8
0
View full text Add to dashboard Cite

Electric-field effects on theN=31Po
Yk
¹
,
Callaway
²

1994
Phys. Rev. A
19
1
8
0
View full text Add to dashboard Cite

An Experimentalist's View of the H⁻ Ion

Double Photoexcitation of Helium in a Strong dc Electric Field

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Stability of theo1shape resonance in

Cited by 24 publications

References 16 publications

Electric-field effects on theN=31PoYk1, Callaway2 1994Phys. Rev. A19180View full textAdd to dashboardCite

Electric-field effects on theN=31PoYk1, Callaway2 1994Phys. Rev. A19180View full textAdd to dashboardCite

An Experimentalist's View of the H− Ion

Double Photoexcitation of Helium in a Strong dc Electric Field

Contact Info

Product

Resources

About

Electric-field effects on theN=31Po
Yk
¹
,
Callaway
²

1994
Phys. Rev. A
19
1
8
0
View full text Add to dashboard Cite

Electric-field effects on theN=31Po
Yk
¹
,
Callaway
²

1994
Phys. Rev. A
19
1
8
0
View full text Add to dashboard Cite

An Experimentalist's View of the H⁻ Ion