Ionization potentials and ionization limits derived from the analyses of optical spectra

Moore, Charlotte E.

doi:10.6028/nbs.nsrds.34

Cited by 275 publications

(266 citation statements)

References 9 publications

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“…Recently [5], an experimental value of D°(CH 3 -Br) = 2.996 ± 0.006 eV has been reported. Taking IE[Br ( 2 P 3/2 ) → Br + ( 3 P 2 )] = 11.814 eV [12], one obtains an AE[Br + ( 3 P 2 )] = 14.810 eV. All predicted thresholds are significantly lower than the present experimental value at 15.00 ± 0.05 eV.…”

Section: (B))contrasting

confidence: 40%

“…Entrance and exit slit widths of 100 µm provided 0.1 nm wavelength resolution. Wavelength calibration is performed by recording the Ar + ( 2 P 3/2 -2 P 1/2 ) ion yield curve and using the Ar + ionization energy IE(Ar + -2 P 3/2 ) = 15.759 eV [12]. The same procedure as described in Section 2.1 has been adopted.…”

Section: The Photoionization Mass Spectrometrymentioning

confidence: 99%

“…The spectrum is scanned again and the reproducibility of the peak maximum position is about 2-3 meV. In the present case Xe has been used for this purpose and the value of the ionization energy IE(Xe + -2 P 3/2 ) = 12.130 eV [12] has been adopted.…”

Section: The Threshold Photoelectron and Constant Ion State Spectroscopymentioning

confidence: 99%

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About the photoionization of methyl bromide (CH3Br). Photoelectron and photoionization mass spectrometric investigation

et al. 2006

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The threshold photoelectron (TPES) and the photoionization mass spectrometric study of CH 3 Br in the 8-20 eV photon energy range is presented. The interpretation and assignments are supported by ab initio calculations. The TPES shows several new discrete features in the Jahn-Teller split ground state X 2 E( 2 A'-2 A") of CH 3 Br + . An additional continuous band starts at about 11.8 eV. These observations are both correlated with direct ionization and autoionizing transitions. This is supported by constant ion state (CIS) spectroscopy. A large enhancement of the transitions to the A 2 A and B E states is ascribed to important autoionizing contributions. Based on the present calculations, the weak to very weak bands in the 17.5-22.0 eV photon energy range were mainly assigned to 2a 1 -1 ionization and to double excitations described essentially by the 2e -2 4a 1 1 and le -1 2e -1 4a 1 1 configurations. The photoionization mass spectrometric study allowed us to investigate in detail the ionization and dissociation of CH 3 Br + leading to CH 2 + , CH 3 + , Br + and CH 2 Br + from threshold up to 20 eV photon energy. The experimental data are compared to ab initio dissociation energies. At the onset, the CH 3 + and CH 2 Br + fragment ion production is correlated with the ground state of CH 3 Br + and both fragment ions have to appear through dissociative autoionization from the (3a 1 1 /1e 3 )6s or 5s Rydberg state. This interpretation is supported by the photoabsorption spectrum measured recently in the same photon energy range. At higher energies, beside a likely direct (pre)dissociation of the Ã 2 A 1 and B 2 E states of CH 3 Br + , autoionization also contributes to the fragmentation in all decay channels. Avoided crossings in a manifold of 2 A' states are likely to be involved. This is supported by ab initio calculations. For CH 3 + the photoion-pair process is analyzed and detailed assignments are proposed on the basis of our latest VUV photoabsorption spectroscopic data.

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Section: (B))contrasting

confidence: 40%

Section: The Photoionization Mass Spectrometrymentioning

confidence: 99%

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About the photoionization of methyl bromide (CH3Br). Photoelectron and photoionization mass spectrometric investigation

et al. 2006

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“…In charge transfer experiments involving CO and He + , for which the recombination energy is 24.587 eV [19], Derrick and Szabo [21] observed C + ions, mainly as primary ions. Using He + in a charge exchange reaction with CO the intensity of the metastable peak corresponding to CO + (metast.)…”

Section: Dissociation Limit At (2423 ± 003) Evmentioning

confidence: 99%

“…Table 2. Dissociation limits and products for CO + → C + + O calculated using D 0 0 (CO) = 11.109 eV [20], IP(CI) = 11.260 eV [19] and EA(O) = 1.465 eV [24]. The energy levels of C + and O are taken from ref.…”

Section: The Ionization Efficiency Curve Of Co +mentioning

confidence: 99%

The dissociative ionization of carbon monoxide

Locht

1977

Chemical Physics

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The dissociative ionization of CO by low energy electron impact into C + + O (or O -) and O + + C (or C -) is investigated using ion energy and mass analysis. The kinetic energy distributions are studied as a function of the impinging electron energy. The threshold energies of C + and O + are measured as a function of the released kinetic energy. The formation of the products in their ground level and with a small amount of kinetic energy mainly occurs through predissociation. The CO + electronic states involved in these processes are tentatively identified. New evidences have been found for the importance of dissociative ionization via autoionization.

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Atomic Structure

Luther

2016

Inorganic Chemistry for Geochemistry and Environmental Sciences

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Ionization potentials and ionization limits derived from the analyses of optical spectra

Cited by 275 publications

References 9 publications

About the photoionization of methyl bromide (CH3Br). Photoelectron and photoionization mass spectrometric investigation

About the photoionization of methyl bromide (CH3Br). Photoelectron and photoionization mass spectrometric investigation

The dissociative ionization of carbon monoxide

Atomic Structure

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