Electron ionization of N2O

Love, Natalie A.; Price, S. D.

doi:10.1039/b408853k

Cited by 27 publications

(41 citation statements)

References 38 publications

(121 reference statements)

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“…As described above, to determine the ion detection efficiency (f i ) we recorded singles and pairs spectra of CF 4 at ionizing electron energies of 100 and 200 eV. Comparison of this data to the absolute cross-sections of Bruce and Bonham [39,40] resulted in a value of f i = 0.20 ± 0.01, in close agreement with previous determinations of f i for our apparatus [19,31,30].…”

Section: Resultssupporting

confidence: 73%

“…This data is shown to be in excellent agreement with the existing PICS of Straub et al [14] and Tian and Vidal [16]. We then present precursor-specific relative PICS σ n [X m+ ], which, as shown by our recent studies of the electron ionization of C 2 H 2 [30] and N 2 O [31], quantify the contribution to the yield of a fragment ion from single (n = 1), double (n = 2) and triple (n = 3) ionization. These precursor-specific relative PICS include, for the first time, measurements on the formation of ion triples following electron-ionization of CO 2 .…”

Section: Introductionsupporting

confidence: 83%

“…To measure the ion detection efficiency f i separate experiments were performed, under the same voltage conditions employed in this study, to record the intensity of single ions and ion pairs formed by electron ionization of CF 4 . Comparison of this data to the corresponding absolute measurements of Bruce and Bonham [39,40] yields a value of f i , as has been described previously in the literature [37,31,30].…”

Section: Data Reductionmentioning

confidence: 88%

“…We neglect contributions to our coincidence spectra from dissociative quadruple ionization. Indeed, previous studies of the electron ionization of small molecules using this apparatus [31,30] indicate that such contributions are extremely small in the energy regime of this work.…”

Section: Data Processingmentioning

confidence: 97%

“…All experiments in this study were performed using a TOFMS of Wiley-McLaren design, as has been discussed in detail in recent publications [37,31,30]. Electron ionization of a continuous effusive jet of CO 2 is performed by a pulsed beam of ionizing electrons with a duration 30 ns per pulse and a repetition rate of 50 kHz.…”

Section: Experimental Apparatusmentioning

confidence: 99%

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Electron ionization of CO2

King

Price

2008

International Journal of Mass Spectrometry

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Section: Resultssupporting

confidence: 73%

Section: Introductionsupporting

confidence: 83%

Section: Data Reductionmentioning

confidence: 88%

Section: Data Processingmentioning

confidence: 97%

Section: Experimental Apparatusmentioning

confidence: 99%

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Electron ionization of CO2

King

Price

2008

International Journal of Mass Spectrometry

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On the N₂O correction used for mass spectrometric analysis of atmospheric CO₂

Assonov

Brenninkmeijer

2006

Rapid Comm Mass Spectrometry

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To obtain accurate values of delta(13)C(CO(2)) and delta(18)O(CO(2)) on environmental CO(2) by mass spectrometry, the raw isotope data must be corrected for the isobaric N(2)O contribution. This is one of the analytical problems limiting inter-laboratory delta(13)C(CO(2)) data consistency. The key parameter, the N(2)O relative ionisation efficiency (E(N2O)), cannot be determined with sufficient accuracy by direct measurements of pure N(2)O. The determination of (E(N2O)) by analyses on N(2)O--CO(2) mixtures of known isotope composition and mixing proportions has been recently suggested. In this work we propose a new method of N(2)O correction which uses the m/z 30 signal as a measure of the N(2)O/CO(2) ratio, so that determinations of (E(N2O)) and N(2)O content are not required. The method uses the fact that fragment-ion spectra of N(2)O and CO(2) are very specific. The formalism of the correction is considered. Various tests demonstrate that the new method is robust, stable and easy to implement in practice. The effective value (E(N2O)) (the key parameter for the new correction) has to be calibrated on known N(2)O--CO(2) mixtures by measuring (30)R signals only. The method accuracy we presently achieved is around 2.5% and any error which appears to come mostly from our N(2)O--CO(2) mixture preparation. Based on our tests and error considerations, the error of the proposed method that may be achieved is as low as +/-1.5% (relative to the correction magnitude). For tropospheric CO(2) this means +/-0.003 per thousand and +/-0.005 per thousand for delta(13)C(CO(2)) and delta(18)O(CO(2)), respectively. The proposed method may be valuable for small samples where no separate N(2)O determinations are available (e.g. ice core samples and CF-IRMS measurements) as well as for determination of (E(N2O)) and testing the 'traditional' N(2)O correction based on mass balance calculations.

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