Measurement of density-sensitive electric quadrupole transitions in neonlike laser-produced plasmas

Young, B. K.; Osterheld, A. L.; Walling, R. S.; Goldstein, W. H.; Phillips, T. W.; Stewart, Richard E.; Charatis, G.; Busch, G. E.

doi:10.1103/physrevlett.62.1266

Cited by 22 publications

(15 citation statements)

References 14 publications

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“…In neonlike xenon, for example, the (2s 2 2p 5 1/2 3s 1/2 ) J =0 level has energetically overtaken all 2p 3/2 core vacancy levels except one. The exception is the (2s 2 2p 5 3/2 3d 5/2 ) J =1 level, which is 5 3/2 3p 3/2 ) J =3 , and (2p 5 3/2 3p 3/2 ) J =1 , respectively. Levels 16-18 are (2p 5 1/2 3s 1/2 ) J =1 , (2p 5 1/2 3s 1/2 ) J =0 , and (2p 5 3/2 3d 5/2 ) J =1 , respectively.…”

Section: Resultsmentioning

confidence: 98%

“…Among these levels, there are only two electric dipole-allowed transitions to the (2s 2 2p 6 ) J =0 ground state. The (2s 2 2p 5 1/2 3s 1/2 ) J =0 level (level 3 in the figure) can only decay by a magnetic dipole transition to the (2s 2 2p 5 3/2 3s 1/2 ) J =1 level. Electric quadrupole decay to the (2s 2 2p 5 3/2 3s 1/2 ) J =2 level is, in principle, also possible.…”

Section: Resultsmentioning

confidence: 99%

“…For example, there are several electric quadrupole (E2) transitions from upper levels 2s 2 2p 5 3p and 2s2p 6 3d to the closed-shell (2s 2 2p 6 ) J =0 ground state that have been detected [1][2][3][4], and some of these transitions have been used for plasma diagnostics [5]. The lowest excited level in neonlike ions, the (2s 2 2p 5 3/2 3s 1/2 ) J =2 level, decays by a magnetic quadrupole (M2) transition to the ground state. The x-ray line produced by this decay was shown to be sensitive not only to electron density [6][7][8] but also to strong photon fields [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Among the 2s 2 2p 5 3s levels, there is another metastable level, i.e., the (2s 2 2p 5 1/2 3s 1/2 ) J =0 level. In neonlike ions with low atomic number Z, such as argon (Z = 18) or iron (Z = 26), this level is the third-lowest excited level.…”

Section: Introductionmentioning

confidence: 99%

“…The first is via a magnetic dipole (M1) transition to the (2s 2 2p 5 3/2 3s 1/2 ) J =1 level, which is the second-lowest excited level in these neonlike ions. Because the energy splitting between these two levels is small, the associated spectral line is typically in the ultraviolet.…”

Section: Introductionmentioning

confidence: 99%

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Radiative decay probabilities of the(2s22p1/253s1/

2011

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The radiative decay rates of the (2s 2 2p 5 1/2 3s 1/2 ) J =0 level in neonlike ions have been calculated for nuclear charges ranging from Z = 10 to Z = 110. The calculations include the magnetic dipole decay to the (2s 2 2p 5 3/2 3s 1/2 ) J =1 level, which is shown to be the dominant decay branch in low-Z and very-high-Z ions, as well as the two-electron, one-photon decays to the (2s 2 2p 5 3/2 3p 1/2 ) J =1 and (2s 2 2p 5 3/2 3p 3/2 ) J =1 levels, which dominate near Z = 50. We also take into account a small magnetic quadrupole decay branch to the (2s 2 2p 5 3/2 3s 1/2 ) J =2 level and calculate the total radiative lifetime of the (2s 2 2p 5 1/2 3s 1/2 ) J =0 level. The resulting values span over 15 orders of magnitude, and much of this range is accessible with modern atomic lifetime measurement techniques. In particular, we calculate a value of 1.6 × 10 4 s −1 for the radiative decay rate of the (2s 2 2p 5 1/2 3s 1/2 ) J =0 level in Fe XVII and show that the corresponding magnetic dipole transition has a measurable spectral intensity for electron densities below about 1 × 10 13 cm −3 .

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Radiative decay probabilities of the(2s22p1/253s1/

2011

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Measurements of L‐shell X‐ray emission lines of neonlike europium on an electron beam ion trap

et al. 2019

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We report a measurement of the two x-ray transitions that proceed from the (1s 2 2s 2 2p 5 1/2 3d 3/2 ) J=1 and (1s 2 2s 1/2 2p 6 3p 1/2 ) J=1 upper levels to the (1s 2 2s 2 2p 6 ) J=0 ground level in neonlike Eu 53+ (Z = 63), i.e. near the previously documented avoided crossing of the two upper levels at Z = 68. The measurement was carried out using the calorimeter spectrometer on the Livermore EBIT-I electron beam ion trap. It affirms the trends set by the neighboring neonlike ions both in terms of the relative intensity of the two lines and in terms of the magnitude of disagreement with theoretical energy level predictions.

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Atomic physics studies of highly charged ions on tokamaks using X-ray spectroscopy

Beiersdörfer

Goeler

Bitter

et al. 1989

Nuclear Instruments and Methods in Physics Research Section B:

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This report was prepared as en account of work sponsored b, an agency of .he UnitedjSlates S^rnnTen.. Nehher ,be United Su.cs Governmen, nor any agency tlureofnor ay^ofthe* emrLvces makes any warranty, express or implied, or assumes any legal liability or rcspons-% T oTthT a™, compfetcn J. or usefulness of any information •l^"^*? pr «L disclosed, or represents that its use would no. tnfnnge private y «"*^^ er.ee herein to any specific commercial product. prc«ss. or service by «»««»«* ""£ manufacturer, or otherwise does not necessarily constitute or tmply "«£"?* ^£, mendation, or favoring by .he United States Government or any agency thereon The nm and opinions of authors e.prcssed herein do not necessarily state or reflect those of the United Stales Government or any agency thereof.

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Measurement of density-sensitive electric quadrupole transitions in neonlike laser-produced plasmas

Cited by 22 publications

References 14 publications

Radiative decay probabilities of the(2s22p1/253s1/

Radiative decay probabilities of the(2s22p1/253s1/

Measurements of L‐shell X‐ray emission lines of neonlike europium on an electron beam ion trap

Atomic physics studies of highly charged ions on tokamaks using X-ray spectroscopy

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