Light polarization of mercury 6s6p1P1and 6s6p3P1resonant transitions excited by electron impact

Herting, C; Hanne, G F

doi:10.1088/0953-4075/35/3/105

Cited by 9 publications

(5 citation statements)

References 12 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[13] and that for rotationally unresolved transitions in N 2 [18,19], these are the only data of which we are aware that exhibit this behavior, with the caveats that the collisions involve simple excitation without fragmentation and are unperturbed by the presence of obvious negative-ion resonances. We note that a few atomic systems [7,9,20] exhibit this behavior, but do so as required by The present rotationally resolved results are compared with our previous measurements with a wider bandwidth filter [18] and data from other groups [13,15,16]. Also shown are the theoretical predictions of Meneses et al [17].…”

supporting

confidence: 65%

“…Generally, the value of þ1 is reduced by a number of kinematic factors internal to the target: electron spin and nuclear spin depolarization and the atomic orbital angular momentum coupling scheme [4][5][6]. Certain coupling schemes can lead to negative values of P 1 [7][8][9]. In all cases, however, threshold dynamics rigorously require that only states with M L ¼ 0 be populated at threshold.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Threshold Alignment Reversal and Circularly Polarized Fluorescence in Rotationally ResolvedH2

Maseberg

Bartschat

2013

Phys. Rev. Lett.

View full text Add to dashboard Cite

Using H2 and D2 targets, we have measured the polarization of Fulcher-band fluorescence resulting from spin-polarized electron-impact excitation of vibrationally and rotationally resolved d 3Π(u) → a 3Σ(g)+ transitions for incident electron energies from 14.3 to 28.5 eV. Near threshold, the linear polarization P1 descends from positive values through zero to negative values, indicating a dynamic production of M(N)=0 states. The circular polarization P3 is measured to be nonzero, indicating the orientation of rotationally resolved molecular states. For Q-branch transitions, P3 is consistent with theory based on Hund's case (b) coupling. The R-branch P3 values do not agree with theory equally well, indicating the effect of Σ-symmetry perturbation of the parent d 3Π(u)+ state.

show abstract

supporting

confidence: 65%

mentioning

confidence: 99%

Threshold Alignment Reversal and Circularly Polarized Fluorescence in Rotationally ResolvedH2

Maseberg

Bartschat

2013

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…In the experimental set-up (see Herting et al [1] and Herting and Hanne [3] for details), a GaAs electron source generated a spin-polarized electron beam with a degree of polarization of (28 ± 1.4)% to excite the target atoms. An oven evaporated the mercury atoms at a temperature of 50 • C. The decay photons with a wavelength of λ = 185 nm were detected for emission normal to the scattering plane via a photomultiplier tube and analysed according to the definition of the three Stokes parameters.…”

Section: Methodsmentioning

confidence: 99%

(e, eγ)-coincidence studies to determine spin-resolved Stokes parameters of the 185 nm emission line in mercury

Außendorf¹,

Jüttemann²,

Muktavat³

et al. 2006

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

Self Cite

View full text Add to dashboard Cite

Direct measurements of the three Stokes parameters (polarization components) P 1 , P 2 and P 3 of the VUV Hg transition 6s6p 1 P 1 → 6s 2 1 S 0 (185 nm) have been carried out at electron impact energies of 15 eV, 50 eV and 100 eV. Within the experimental uncertainty, no influence of the electron spin was discovered for scattering angles θ 30 • . At 15 eV excitation energy and scattering angles θ 80 • , increasing spin effects become apparent. The experimental data are compared to theoretical predictions from a first-order full-relativistic distortedwave model, a five-state Breit-Pauli R-matrix (close-coupling) approach, and a convergent close-coupling model, in which relativistic effects are accounted for by adding non-relativistic amplitudes using known intermediate-coupling coefficients. At scattering angles θ 15 • , all of the theories reproduce the experimental data well, whereas the CCC model exhibits the best overall agreement with experiment at large scattering angles.

show abstract

“…Some of the atoms are excited to the (6s6p) 3 P 1 state by electron impact. A collecting lens transforms the emitted fluorescence light (254 nm) to a parallel beam, which passes through a λ/4 retarder, followed by a linear-polarization analyser of the Brewsterangle type (Herting and Hanne 2002) and an interference filter for state selection. A second lens directs the light onto the cathode of a photomultiplier tube.…”

Section: Methodsmentioning

confidence: 99%

Orientation propensities in spin-resolved electron-impact excitation of mercury

Herting

Hanne

Bartschat

et al. 2002

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

Self Cite

View full text Add to dashboard Cite

The atomic orientation J⊥+ generated by polarized-electron impact excitation of Hg (6s2)1S0 → (6s6p)3P1 is studied using the electron–photon coincidence technique. J⊥+ shows a significant dependence on the spin projection of the incident electrons. Experimental results are compared with theoretical predictions employing a semi-relativistic five-state R-matrix (close-coupling) description and the relativistic distorted-wave approximation. The experimental data show, in qualitative agreement with the calculations, that the well established orientation propensity rules for light atoms are apparently violated if the electron spin is initially down with respect to the scattering plane. The applicability of the propensity rules to electron-impact excitation of heavy atoms is analysed. The observed apparent violation is attributed to a quantum mechanical interference caused by ‘intermediate coupling’ within the excited state. A re-evaluation of the data supports the validity of the orientation propensity rules.

show abstract

Light polarization of mercury 6s6p¹P₁and 6s6p³P₁resonant transitions excited by electron impact

Cited by 9 publications

References 12 publications

Threshold Alignment Reversal and Circularly Polarized Fluorescence in Rotationally ResolvedH2

Threshold Alignment Reversal and Circularly Polarized Fluorescence in Rotationally ResolvedH2

(e, eγ)-coincidence studies to determine spin-resolved Stokes parameters of the 185 nm emission line in mercury

Orientation propensities in spin-resolved electron-impact excitation of mercury

Contact Info

Product

Resources

About