The retrieval of low current pulses from noise for attachment measurements in weakly attaching gases

Dutton, J.; Goodings, A.; Lucas, A. K.; Williams, A. W.

doi:10.1088/0022-3735/21/3/005

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…More recently, Woo et al have studied trichloroethene in detail using much higher-resolution photoionisation studies [8,9], while resonanceenhanced multi-photon ionisation spectra for both molecules have been reported by Williams and Cool [10,11]. Multi-photon ionisation spectra for tetrachloroethene have been published by Heath and Robins and Duttont et al [12,13]. The photoabsorption spectrum of trichloroethene has been studied by Walsh and Warsop [14], and the electron energy loss spectra of both molecules has been published by Koerting et al [15].…”

Section: Introductionmentioning

confidence: 99%

Threshold photoelectron photoion coincidence spectroscopy of trichloroethene and tetrachloroethene

et al. 2008

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The threshold photoelectron, the threshold photoelectron photoion coincidence and ion breakdown spectra of trichloroethene and tetrachloroethene have been recorded from 9 -22 eV. Comparisons with the equivalent data for the three dichloroethene molecules and theoretical calculations highlight the nature of the orbitals involved during photoionisation in this energy range. The ground electronic state of C 2 HCl 3 + (C 2 Cl 4 + ) is bound, with excited valence states dissociating to C 2 HCl 2 + (C 2 Cl 3 + ) and C 2 HCl + (C 2 Cl 2 + ). Appearance energies suggest that C 2 HCl + forms from C 2 HCl 3 + by loss of two chlorine atoms, whereas C 2 Cl 2 + forms from C 2 Cl 4 + by loss of a Cl 2 molecule. The translational kinetic energy release into C 2 HCl 2 + (C 2 Cl 3 + ) + Cl is determined as a function of energy. In both cases, the fraction of the available energy released into translational energy of the two products decreases as the photon energy increases.3

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Section: Introductionmentioning

confidence: 99%

Threshold photoelectron photoion coincidence spectroscopy of trichloroethene and tetrachloroethene

et al. 2008

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“…For each pulse of photo-electrons the current transient at the collector thus consisted of an initial pulse due to unattached electrons followed by a slower negative ion pulse due to negative ions formed in the attachment process. Successive current transients for the same experimental conditions were passed to a low-noise amplifier and converted into voltage transients, which were signal averaged by a digital waveform recording system, comprising a digital storage oscilloscope, microprocessor and ancillary devices interlinked by a GPIB (IEEE-488) digital interface [ 3 ] . This technique of signal averaging differed from methods employed in other experiments in that the whole current transient was recorded for each pulse.…”

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confidence: 99%

“…The drift tube was then re-evacuated and the procedure repeated for different gas number densities. For a particular value of E / N and N , calculation of the areas under the electron ( A , ) and negative ion (Ai) pulses from the measured current transients enabled attachment coefficients to be determined [4,5], where a = -1n 1 (T). A , +Ai d 0022-37271871101322 + 02 $02.50 @ 1987 IOP Publishing Ltd ), Lakshminarasimha and co-workers (+) and those calculated by Hayashi (-).…”

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confidence: 99%