Observation of coherence effects in the polarization of Lyman-α fluorescence following photodissociation of H2

Flemming, E; Reichardt, G.; Schmoranzer, H.; Wilhelmi, O.

doi:10.1016/0375-9601(94)91014-6

Cited by 9 publications

(10 citation statements)

References 15 publications

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“…5 In order to test these predictions, a measurement of the polarization of Lyman-␣ fluorescence at 121.6 nm following direct photodissociation at different excitation energies was carried out. The preliminary results 11 showed clearly oscillations but the measured degree of polarization was lower than the predicted values by at least a factor of 2. In view of this situation it appeared worthwhile to extend and complete the experimental values as well as to improve the theoretical treatment by taking into account a more adequate description of the B -BЈ nonadiabatic coupling 26 and of the collisional quenching.…”

Section: Introductionmentioning

confidence: 75%

“…11,27,28 The synchrotron radiation from the storage ring at BESSY, Berlin was monochromatized by the 3 m-normal-incidence monochromator 3m-NIM2. This monochromator was equipped with a 2400 1/mm holographic grating with which a resolution of 0.005 nm was attained.…”

Section: Methodsmentioning

confidence: 99%

“…[9][10][11] By full quantum mechanical calculations Glass-Maujean and Beswick 4 -6 stated that the degree of linear polarization of radiating photofragments is dependent on interference effects between the continua excited coherently. The hydrogen molecule H 2 and its isotope D 2 allowed precise theoretical ab initio calculations of the linear polarization, 5 since the electronic potential curves of the states involved, [12][13][14][15] the adiabatic corrections 16 -19 and the transition dipole moments [20][21][22] are very well known.…”

Section: Introductionmentioning

confidence: 99%

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Coherence effects in the polarization of Lyman-α fluorescence following photodissociation of H2 and D2

Flemming

Wilhelmi

Schmoranzer

et al. 1995

The Journal of Chemical Physics

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Articles you may be interested inLaser induced fluorescence measurements of microwave stimulated OH molecules from H2O photodissociation Lymanα, Lymanα coincidence detection in the photodissociation of doubly excited molecular hydrogen into two H(2p) atoms J. Chem. Phys. 88, 3016 (1988); 10.1063/1.453943 H Lymanα emission from photodissociation of H2OThe polarization of the Lyman-␣ fluorescence following photodissociation of H 2 and D 2 into fragments in the 1s and 2l states has been determined as a function of the excess energy of the fragments. The predicted oscillations of the polarization as a function of excess energy were clearly observed. In addition, the theoretical polarization was recalculated including the stronger B -BЈ coupling scheme as well as collisional effects on the polarization. The collisional effects include the quenching processes for H(2s) and H(2p) and disaligning collisions. The calculations reproduced the experimental data quite well giving a cross section for the disaligning collisions of ͑1.0Ϯ0.2͒•10 Ϫ14 cm 2 for H 2 and D 2 at a gas temperature of 137 K in the relative velocity range of 2 to 7 km s Ϫ1 . This can be considered as a proof of the theoretical predictions on the interference effects between the continua excited coherently.

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Section: Introductionmentioning

confidence: 75%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coherence effects in the polarization of Lyman-α fluorescence following photodissociation of H2 and D2

Flemming

Wilhelmi

Schmoranzer

et al. 1995

The Journal of Chemical Physics

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“…Wavelengthdependent oscillations in the photofragment alignment caused by multiple-surface interference have been observed in the electronically excited H (2p) and D (2p) photofragments resulting from the photodissociation of H 2 and D 2 . 5,6 The oscillations observed in the total alignment are exclusively caused by the Re͓a 1…”

Section: Introductionmentioning

confidence: 99%

Measurements of Cl-atom photofragment angular momentum distributions in the photodissociation of Cl2 and ICl

Rakitzis

Kandel

Alexander

et al. 1999

The Journal of Chemical Physics

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We have studied the complete Cl-atom molecular-frame photofragment angular momentum distributions from the photodissociation of Cl 2 and ICl in the 320-560 nm region using time-of-flight mass spectroscopy with laser detection. The experimental signals were analyzed using the polarization-parameter formalism described in the preceding paper. These experiments study three distinct cases. The first case is the 470 nm dissociation of Cl 2 through the B 3 ⌸ 0 ϩ u state accessed via a parallel transition, yielding Cl-atom photofragments with polarizations described by the single parameter a 0 (2) (ʈ)ϭϪ0.7Ϯ0.2. The second case is the 320 nm dissociation of Cl 2 through the C 1 ⌸ 1u state accessed via a perpendicular transition, yielding Cl-atom photofragments with polarizations described by the two parameters a 0 (2) (Ќ)ϭϪ0.50Ϯ0.10 and a 2 (2) (Ќ)ϭϪ0.32Ϯ0.06. The third case is the dissociation of ICl in the 490-560 nm region in which dissociative states of both parallel and perpendicular character are accessed. In this wavelength region, the polarizations of the resulting Cl-atom photofragments are completely described by the approximately constant incoherent parameters, a 0 (2) (ʈ)Ϸϩ0.4, a 0 (2) (Ќ)ϷϪ0.2, and a 2 (2) (Ќ)ϷϪ0.2, whereas the interference contributions to the polarization, the Im͓a 1 (1) (ʈ ,Ќ)͔ and Re͓a 1 (2) (ʈ ,Ќ)͔, oscillate sinusoidally with excitation wavelength in a fashion that is sensitive to the shapes of the dissociative surfaces.

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“…Source: Reproduced with permission from Flemming et al[4]. Source: Reproduced with permission from Flemming et al[4].…”

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confidence: 99%

Introduction to Basic Properties of Hydrogen

2014

Hydrogen Generation, Storage, and Utilization

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Observation of coherence effects in the polarization of Lyman-α fluorescence following photodissociation of H2

Cited by 9 publications

References 15 publications

Coherence effects in the polarization of Lyman-α fluorescence following photodissociation of H2 and D2

Coherence effects in the polarization of Lyman-α fluorescence following photodissociation of H2 and D2

Measurements of Cl-atom photofragment angular momentum distributions in the photodissociation of Cl2 and ICl

Introduction to Basic Properties of Hydrogen

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