Autoionization in HCl and DCl by photoelectron spectroscopy

Natalis, P.; Pennetreau, P.; Longton, L.; Collin, J.E.

doi:10.1016/0301-0104(82)85160-4

Cited by 35 publications

(19 citation statements)

References 25 publications

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“…On the other hand, their threshold photoelectron data exhibit no autoionization structure around 74.37 nm, indicating pure direct photoionization by Nelp. Similarly autoionizing superexcited states of HCI** [52] were suggested to influence the vibrational transition probability distribution in NeI, and NeIp photoionization of HC1 [31]. The 0-1 vibrational spacings reported in Table 2 for NeI,,a photoionization of H F exactly agree with our HeI data.…”

Section: 2supporting

confidence: 88%

Penning ionization and photoionization electron spectrometry of hydrogen fluoride

Yencha

Ruf

Hotop

1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract. An electron spectrometric study has been performed on HF using metastable helium and neon atoms as well as helium and neon resonance photons. High-resolution electron spectra were obtained for a pure He(23S) beam, a mixed He(21S, 23S) beam, a mixed Ne(3s, 3P2, 3Po) beam, and for HeI and NeI VUV light. From the comparison of vibrational populations of HF + (X 2H~, v') and HF+(A 2S+, v') produced by He(23S) metastables and HeI resonance photons, we conclude that there is only a slight perturbation of the HF(X ~S +) potential in He (23S) Penning ionization; no perturbation is found for HF+(X 2/~., v') formation from Ne(3P2,0) metastable ionization of HF. For He (21S) + HF the X-and A-ionic state vibrational peak shapes are substantially broader than in the He(23S)+HF case pointing to an additional, charge exchanged interaction (He + + H F ) in the entrance channel of the former system. The vibrational population found for NeI~ photoionization of HF for formation of HF + (X 2~, v') is found to differ considerably from that for NeIp photoionization and from the Franck-Condon factors for unperturbed HF(X 1X+) and HF + (X 2Hi) potentials suggesting the presence of an autoionizing superexcited state of HF in the energy vicinity of the NeI~ resonance photons. The HF+(X) 2H3/2: 2H1/2 fine-structure branching ratios vary significantly with the ionizing agent in a similar way as previously found in HC1 and HBr.

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Section: 2supporting

confidence: 88%

Penning ionization and photoionization electron spectrometry of hydrogen fluoride

Yencha

Ruf

Hotop

1993

Z Phys D - Atoms, Molecules and Clusters

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“…Our result of 4.69. eV for the dissociation energy of the X 211 state is in good agreement with the experimental value of 4.81 eV. 16 The experimental values of De of Natalis et al 17 for the X 211 and A 2~ + states are Birge-Sponer extrapolations of vibrational levels accessed in: their Penning ionization study and are less reliable than those of Hotop et al 16 …”

Section: A Potential Energy Curvessupporting

confidence: 51%

Theoretical study of HCl+ : Potential curves, radiative lifetimes, and photodissociation cross sections

Pradhan

Kirby

Dalgarno

1991

The Journal of Chemical Physics

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Configuration interaction wave functions and potential energy curves have been calculated for the four lowest states of *II and '8 + symmetry and the lowest state of 42 -, *I; -, *A, and 411 symmetry for the molecular ion HCl + . Dipole moment functions of the X *II and A 22 + states are presented as well as dipole moments for transitions from the X state to dipoleallowed excited states. The electronic wave functions were constructed to give a balanced description of Rydberg-valence interactions. The computed radiative lifetime of the X *II (v = 1) is found to be in good agreement with previous theoretical and experimental values. Oscillator strengths, transition probabilities, and radiative lifetimes are calculated for the A '8 +-X'II transition for vibrational levels v'<6 and compared.to previous theoretical and experimental results. Vibrational levels u')7 of the A '5. + state are predissociated by the "II, 48 -, and '8 -states. Theoretical photodissociation cross sections are calculated showing that photodissociation occurs primarily through absorption into the (3) 'II and (3) *Z + states in the wavelength region il < 100 nm and also the "X -, 2A, and (2) *II states for wavelengths R > 100 nm.

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“…The vibrational spacings in these same three states are also drawn from published results for HCI(XtS +) [28] and HCI+(X2Ha/2,A2S +) [24,29]. This repulsive state may be responsible for the observed [29] breakoff in vibrational emission intensity for v' > 7 in the HC1 + (A 2S+, v' -* X 2/7~, v") transition via predissociation, whereas v' up to 12 has been detected in the HeI PES spectrum of HC1 [24,33] and up to 10 in the He(2 3S) PIES spectrum of HC1 reported here. The vertical dashed lines represent the Franck-Condon region for the ground state of HC1.…”

Section: Electronic States Of Hci +supporting

confidence: 53%

Penning ionization electron spectrometry of hydrogen chloride

Yencha

Ganz

Ruf

et al. 1989

Z Phys D - Atoms, Molecules and Clusters

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An electron spectrometric study has been performed on HC1 using metastable helium and neon atoms as well as neon resonance photons. High resolution electron spectra were obtained with two different beam apparatuses for a mixed He(2 ~S, 23S) beam, a pure He(23S) beam, and, for the first time, state-selected pure Ne(3s3P2) and pure Ne(3s3P0) beams, and for NeI resonance photons. For the system He(23S)+HC1 the vibrational populations P(v') of the formed HCI+(X2//i, v') and HCI+(A 2L'+, v') ions are found to differ from the Franck-Condon factors for unperturbed potentials, indicating slight bond stretching in HC1 upon He(2 3S) approach. For He(21S) + HC1 the vibrational peak shapes and vibrational populations are substantially different from the He(2aS) case, pointing to an additional, charge exchanged interaction (He ÷ +HC1-) in the entrance channel of the former system. For the first time, we have detected the electrons in both the He(21S) + HC1 and He(2 3S) + HC1 spectra associated with the major mechanism for the formation of C1 ÷ ions: energy transfer to repulsive HCI** Rydberg states, dissociating to H(1 s) and autoionizing Ct**(1D2 n/) atoms. For both Ne (3P2)+ HC1 and Ne(3Po)+HC1, the populations P(v') of both final molecular states HCI+(X, A) agree closely with the Franck-Condon factors at the average relative collision energy E~oll = 55 meV and, for HCt + (A 2S+), also at E~o n = 130 meV.

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Autoionization in HCl and DCl by photoelectron spectroscopy

Cited by 35 publications

References 25 publications

Penning ionization and photoionization electron spectrometry of hydrogen fluoride

Penning ionization and photoionization electron spectrometry of hydrogen fluoride

Theoretical study of HCl+ : Potential curves, radiative lifetimes, and photodissociation cross sections

Penning ionization electron spectrometry of hydrogen chloride

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