Spectral identification of diffuse resonances in H2 above the <i>n</i> = 2 dissociation limit

Ivanov, T.I.; Lange, C.A. de; Ubachs, Wim

doi:10.1063/1.3544300

Cited by 4 publications

(3 citation statements)

References 42 publications

(54 reference statements)

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“…As we explained previously, the probe laser at 364 nm may induce three processes, 29,31 Table 1. Line Positions ω 0 , Line Widths Γ, Dimensionless Fano-Parameters q, and Branching Ratios D(2s)/(D(2s) + D(2p)) for the Predissociation of D 2 in the Transitions 3pπD 1 IV.B.…”

Section: Experimental Methodsmentioning

confidence: 97%

“…The electronic spectra and dynamics of H 2 have been studied intensively both in theories and experiments. − Because of the development of new experimental techniques, such as high resolution coherent XUV laser and high resolution XUV Fourier-transform photoabsorption spectral methods, a great deal of attention has been paid recently to the energy region where the photodissociation occurs − …”

Section: Introductionmentioning

confidence: 99%

“…There are still some interesting questions to be answered. The predissociation of the 3p πD 1 Π u + and 4p σB ″Σ u + states occurs via the interactions with the 3p σB ′Σ u + and 2p σB 1 Σ u + states, which are called electronic predissociation. − ,, There is another type of predissociation called tunneling predissociation, in which the molecule has an energy above the dissociation limit, actually, it is a quasi-bound state due to the presence of a barrier to dissociation . Highly vibrational excited states of the 2p πC 1 Π u ± states of D 2 may undergo tunneling predissociation, , because there is a small barrier of ∼80 cm –1 at nuclear distance ∼8 a.u (see Figure ).…”

Section: Introductionmentioning

confidence: 99%

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Electronic and Tunneling Predissociations in the 2pπC¹Π_u^±(υ = 19) and 3pπD¹Π_u^±(υ = 4, 5) States of D₂ Studied by a Combination of XUV Laser and Velocity Map Imaging

Wang

Meng

2017

J. Phys. Chem. A

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The predissociation mechanism of D near the threshold for the production of the D(2s, 2p) fragments has been studied by measuring the fragment yield spectra, fragment velocity map images, and fragment branching ratios D(2s)/(D(2s) + D(2p)) using a combination of XUV laser and velocity map imaging. The predissociation dynamics of the 2pπCΠ(υ = 19) and 3pπDΠ(υ = 4,5) states were studied. The 2pπCΠ(υ = 19) state is a bound state due to a shallow barrier. For the R(0) transition to the 2pπCΠ(υ = 19) state, the experimental results suggest that the predissociation occurs via three channels with decreasing importance: l-uncoupling with the 2pσBΣ state, tunneling, and l-uncoupling with the 3pσB'Σ state. For the R(1) transition to the 2pπCΠ(υ = 19) state, the first channel plays the dominant role. For the Q(1) transition to the 2pπCΠ(υ = 19) state, the predissociation occurs via tunneling as required by symmetry. For the predissociation of the 3pπDΠ(υ = 4,5) states, the experimental data confirm the earlier results indicating that the main perturbing state is 3pσB'Σ. The Beutler-Fano profiles and the associated spectroscopic parameters for the various predissociations have also been obtained. The measured Fano-parameters q for the P- and R-branches of the 3pπDΠ state are found to have opposite signs, and their relationships are in agreement with a formula derived from the Fano equation. Rotationally resolved Beutler-Fano profiles were measured for the P(2) and P(3) lines.

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Section: Experimental Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electronic and Tunneling Predissociations in the 2pπC¹Π_u^±(υ = 19) and 3pπD¹Π_u^±(υ = 4, 5) States of D₂ Studied by a Combination of XUV Laser and Velocity Map Imaging

Wang

Meng

2017

J. Phys. Chem. A

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Heavy Rydberg and ion-pair states: chemistry, spectroscopy and theory

Donovan

Kirrander

Lawley

2022

International Reviews in Physical Chemistry

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Electron and photon dissociation cross sections of the H₂singlet ungerade continua

Liu¹,

Shemansky²,

Johnson³

et al. 2011

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

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Photodissociation cross sections and oscillator strengths for H 2 from the X 1 + g (v i , J i ) levels to the continuum levels of the B 1 + u , C 1 u , B B 1 + u , D 1 u and 5pσ 1 + u states have been calculated. The (v i , J i ) state-specific electron impact dissociation cross sections to the continuum levels of these states have been obtained for the first time over a wide energy range using calculated continuum oscillator strengths along with previously published excitation functions of the Lyman and Werner bands. Estimated cross sections to the higher (n 5) npσ 1 + u and npπ 1 u continua are also provided. Both photon and electron impact excitation cross sections show strong dependences on the initial (v i , J i ) quantum numbers. Thermally averaged electron impact cross sections of all singlet ungerade states increase monotonically with temperature. While excitation to the B 1 + u continuum is the dominant dissociation channel at room temperature, the C 1 u and B 1 + u continua become more important at high temperature (>5000 K). This work, along with the previous calculation of the B 1 + u and D 1 u states by Liu et al (2009a J. Phys. B: At. Mol. Opt. Phys. 42 185203), provides the complete electron impact dissociation cross section of H 2 through the singlet ungerade continua. Electron dissociation cross sections of the singlet ungerade continua are provided for the purpose of modelling atmospheric heating, analysis of occultation measurements and the hot atomic hydrogen plume observed at Saturn.

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Spectral identification of diffuse resonances in H2 above the n = 2 dissociation limit

Cited by 4 publications

References 42 publications

Electronic and Tunneling Predissociations in the 2pπC¹Π_u^±(υ = 19) and 3pπD¹Π_u^±(υ = 4, 5) States of D₂ Studied by a Combination of XUV Laser and Velocity Map Imaging

Electronic and Tunneling Predissociations in the 2pπC¹Π_u^±(υ = 19) and 3pπD¹Π_u^±(υ = 4, 5) States of D₂ Studied by a Combination of XUV Laser and Velocity Map Imaging

Heavy Rydberg and ion-pair states: chemistry, spectroscopy and theory

Electron and photon dissociation cross sections of the H₂singlet ungerade continua

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Spectral identification of diffuse resonances in H2 above the n = 2 dissociation limit

Cited by 4 publications

References 42 publications

Electronic and Tunneling Predissociations in the 2pπC1Πu±(υ = 19) and 3pπD1Πu±(υ = 4, 5) States of D2 Studied by a Combination of XUV Laser and Velocity Map Imaging

Electronic and Tunneling Predissociations in the 2pπC1Πu±(υ = 19) and 3pπD1Πu±(υ = 4, 5) States of D2 Studied by a Combination of XUV Laser and Velocity Map Imaging

Heavy Rydberg and ion-pair states: chemistry, spectroscopy and theory

Electron and photon dissociation cross sections of the H2singlet ungerade continua

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Product

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Electronic and Tunneling Predissociations in the 2pπC¹Π_u^±(υ = 19) and 3pπD¹Π_u^±(υ = 4, 5) States of D₂ Studied by a Combination of XUV Laser and Velocity Map Imaging

Electronic and Tunneling Predissociations in the 2pπC¹Π_u^±(υ = 19) and 3pπD¹Π_u^±(υ = 4, 5) States of D₂ Studied by a Combination of XUV Laser and Velocity Map Imaging

Electron and photon dissociation cross sections of the H₂singlet ungerade continua