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Cafolla, A.A.; Comer, John; Reddish, T J

doi:10.1088/0953-4075/21/21/013

Cited by 29 publications

(12 citation statements)

References 26 publications

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“…The constant ionic state ( C I S ) spectrum for the 2p main line, figure 1, shows structure due to both one and two electron excitations, the singly excited series 2 ~2 p ~( ~S ) n p and the doubly excited states assigned as 2 ~' 2 p ~( ~P ) 3 s n p from photoabsorption data (Codling er a1 1967). No structure could be confirmed above the energy shown in the figure . All of the data in the present paper were taken using a two-dimensional scanning technique (Cafolla et al 1988). An example of the data obtained is shown in figure 2, which represents an overview of the satellites in, listed in table 1.…”

Section: Resultsmentioning

confidence: 99%

Resonance structure in the neon photoelectron satellites

Wills

Cafolla

Svensson

et al. 1990

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

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Doubly excited neutral states of neon, 2s22p4nln'l', have been investigated using photoelectron spectroscopy with synchrotron radiation. The selective decay of these levels into all the energetically accessible ionic states in the range 50-60 eV has been measured. In addition, decay of Ne+ states, with binding energies above the first double ionisation potential, by autoionisation to the Ne2+(3P) state has been observed. 45 46 47 48 49Photon energy lev)

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Section: Resultsmentioning

confidence: 99%

Resonance structure in the neon photoelectron satellites

Wills

Cafolla

Svensson

et al. 1990

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

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“…6 where the sharp peaks clearly occur at the same energies and with roughly the same intensity pattern whether the initial hole is on the carbon or on an oxygen atom. All the intense peaks can be attributed to well-known autoionizations of neutral atomic oxygen, 23,24 of which the doublet near 0.5 eV is particularly characteristic. It is apparent from Fig.…”

Section: A Triple Ionization By Inner Shell Hole Formationmentioning

confidence: 98%

Triple ionization of CO2 by valence and inner shell photoionization

Eland

Andrić

Linusson

et al. 2011

The Journal of Chemical Physics

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Triple ionization of CO(2) by valence and inner shell photoionization. Physics, 135(13) Spectra of triply ionized CO 2 have been obtained from photoionization of the molecule using soft x-ray synchrotron light and an efficient multi-electron coincidence technique. Although all states of the CO +++ 2 trication are unstable, the ionization energy for formation of molecular ions at a geometry similar to that of the neutral molecule is determined as 74 ± 0.5 eV. Journal of Chemical

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“…1-13͒ and HBr, [14][15][16][17][18][19] are perhaps the most studied diatomic molecules in the field of photodissociation and photoionization dynamics. 1,4 The autoionization process results in the formation of a long vibrational progression of the molecular ion, where the vibrational distributions can be modeled using the product of two overlap integrals, i.e., the overlap integral between the cor-responding nuclear wave functions of the ground state and superexcited states as well as between the superexcited states and the molecular ion. In onephoton ionization HX + is hence formed with its vibrational population largely in the X 2 ⌸ i ͓v + =0͔ state.…”

Section: Introductionmentioning

confidence: 99%

Proton formation in 2+1 resonance enhanced multiphoton excitation of HCl and HBr via (Ω=) Rydberg and ion-pair states

Romanescu

Loock

2007

The Journal of Chemical Physics

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Molecular beam cooled HCl was state selected by two-photon excitation of the V (1) summation operator(0(+)) [v=9,11-13,15], E (1) summation operator(0(+)) [v=0], and g (3) summation operator(-)(0(+)) [v=0] states through either the Q(0) or Q(1) lines of the respective (1,3) summation operator(0(+))<--<--X (1) summation operator(0(+)) transition. Similarly, HBr was excited to the V (1) summation operator(0(+)) [v=m+3, m+5-m+8], E (1) summation operator(0(+)) [v=0], and H (1) summation operator(0(+)) [v=0] states through the Q(0) or Q(1) lines. Following absorption of a third photon, protons were formed by three different mechanisms and detected using velocity map imaging. (1) H(*)(n=2) was formed in coincidence with (2)P(i) halogen atoms and subsequently ionized. For HCl, photodissociation into H(*)(n=2)+Cl((2)P(12)) was dominant over the formation of Cl((2)P(32)) and was attributed to parallel excitation of the repulsive [(2) (2)Pi4llambda] superexcited (Omega=0) states. For HBr, the Br((2)P(32))Br((2)P(12)) ratio decreases with increasing excitation energy. This indicates that both the [(3) (2)Pi(12)5llambda] and the [B (2) summation operator5llambda] superexcited (Omega=0) states contribute to the formation of H(*)(n=2). (2) For selected intermediate states HCl was found to dissociate into the H(+)+Cl(-) ion pair with over 20% relative yield. A mechanism is proposed by which a bound [A (2) summation operatornlsigma] (1) summation operator(0(+)) superexcited state acts as a gateway state to dissociation into the ion pair. (3) For all intermediate states, protons were formed by dissociation of HX(+)[v(+)] following a parallel, DeltaOmega=0, excitation. The quantum yield for the dissociation process was obtained using previously reported photoionization efficiency data and was found to peak at v(+)=6-7 for HCl and v(+)=12 for HBr. This is consistent with excitation of the repulsive A(2) summation operator(12) and (2) (2)Pi states of HCl(+), and the (3) (2)Pi state of HBr(+). Rotational alignment of the Omega=0(+) intermediate states is evident from the angular distribution of the excited H(*)(n=2) photofragments. This effect has been observed previously and was used here to verify the reliability of the measured spatial anisotropy parameters.

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Cited by 29 publications

References 26 publications

Resonance structure in the neon photoelectron satellites

Resonance structure in the neon photoelectron satellites

Triple ionization of CO2 by valence and inner shell photoionization

Proton formation in 2+1 resonance enhanced multiphoton excitation of HCl and HBr via (Ω=) Rydberg and ion-pair states

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