Journal of Chromatography A

1996

DOI: 10.1016/0021-9673(95)00878-0

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Assessing breakthrough times for denuder samplers with emphasis on volatile organic compounds

Agneta Bemgård¹,

Anders Colmsjö²,

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Introduction2

Threshold Binding Energies1

Mass Window and Comparison To A Quadrupole Based Api-tof Ms1

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1997

1997

2019

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Cited by 5 publications

(4 citation statements)

References 22 publications

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“…From this, the threshold binding energy for their instrument seems to be even above the TOF-CIMS in . In contrast, Bertram et al (2011) showed a mass spectrum of acetate-acetic acid cluster ions where under weak electric fields (15 V cm −1 throughout the APi) higherorder clusters (C 2 H 3 O − 2 (C 2 H 4 O 2 ) 1−2 ) were also detectable with their TOF-CIMS instrument (Bertram et al, 2011). The binding energy of the trimer (C 2 H 3 O − 2 (C 2 H 4 O 2 ) 2 ) is 19.6 kcal mol −1 (Meot-Ner and Sieck, 1986).…”

Section: Threshold Binding Energiesmentioning

confidence: 90%

“…Few publications explicitly studied fragmentation inside the APi-TOF mass spectrometer (Bertram et al, 2011;Brophy and Farmer, 2016;Lopez-Hilfiker et al, 2016). Bertram et al (2011) showed that fragmentation of cluster ions is strongly sensitive to the voltage settings in the APi.…”

Section: Introductionmentioning

confidence: 99%

“…Few publications explicitly studied fragmentation inside the APi-TOF mass spectrometer (Bertram et al, 2011;Brophy and Farmer, 2016;Lopez-Hilfiker et al, 2016). Bertram et al (2011) showed that fragmentation of cluster ions is strongly sensitive to the voltage settings in the APi. Lopez-Hilfiker et al (2016) as well as Brophy and Farmer (2016) used two different types of chemical ionisation (CI) APi-TOF to study fragmentation of reagent-adduct cluster ions.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of the transfer of cluster ions through an atmospheric pressure interface time-of-flight mass spectrometer with hexapole ion guides

¹

,

²

,

³

et al. 2019

Atmos. Meas. Tech.

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Abstract. Here we present an alternative approach of an atmospheric pressure interface (APi) time-of-flight mass spectrometer for the study of atmospheric ions and cluster ions, the so-called ioniAPi-TOF. The novelty is the use of two hexapoles as ion guides within the APi. In our case, hexapoles can accept and transmit a broad mass range enabling the study of small precursor ions and heavy cluster ions at the same time. Weakly bound cluster ions can easily de-cluster during ion transfer depending on the voltages applied to the ion transfer optics. With the example system of H3O+(H2O)n=0-3, we estimate that cluster ions with higher binding energies than 17 kcal mol−1 can be transferred through the APi without significant fragmentation, which is considerably lower than about 25 kcal mol−1 estimated from the literature for APi-TOFs with quadrupole ion guides. In contrast to the low-fragmenting ion transfer, the hexapoles can be set to a high-fragmenting declustering mode for collision-induced dissociation (CID) experiments as well. The ion transmission efficiency over a broad mass range was determined to be on the order of 1 %, which is comparable to existing instrumentation. From measurements under well-controlled conditions during the CLOUD experiment, we demonstrate the instrument's performance and present results from an inter-comparison with a quadrupole-based APi-TOF.

“…From this, the threshold binding energy for their instrument seems to be even above the TOF-CIMS in . In contrast, Bertram et al (2011) showed a mass spectrum of acetate-acetic acid cluster ions where under weak electric fields (15 V cm −1 throughout the APi) higherorder clusters (C 2 H 3 O − 2 (C 2 H 4 O 2 ) 1−2 ) were also detectable with their TOF-CIMS instrument (Bertram et al, 2011). The binding energy of the trimer (C 2 H 3 O − 2 (C 2 H 4 O 2 ) 2 ) is 19.6 kcal mol −1 (Meot-Ner and Sieck, 1986).…”

Section: Threshold Binding Energiesmentioning

confidence: 90%

“…Few publications explicitly studied fragmentation inside the APi-TOF mass spectrometer (Bertram et al, 2011;Brophy and Farmer, 2016;Lopez-Hilfiker et al, 2016). Bertram et al (2011) showed that fragmentation of cluster ions is strongly sensitive to the voltage settings in the APi.…”

Section: Introductionmentioning

confidence: 99%

“…Few publications explicitly studied fragmentation inside the APi-TOF mass spectrometer (Bertram et al, 2011;Brophy and Farmer, 2016;Lopez-Hilfiker et al, 2016). Bertram et al (2011) showed that fragmentation of cluster ions is strongly sensitive to the voltage settings in the APi. Lopez-Hilfiker et al (2016) as well as Brophy and Farmer (2016) used two different types of chemical ionisation (CI) APi-TOF to study fragmentation of reagent-adduct cluster ions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterisation of the transfer of cluster ions through an atmospheric pressure interface time-of-flight mass spectrometer with hexapole ion guides

¹

,

²

,

³

et al. 2019

Atmos. Meas. Tech.

View full text Add to dashboard Cite

Abstract. Here we present an alternative approach of an atmospheric pressure interface (APi) time-of-flight mass spectrometer for the study of atmospheric ions and cluster ions, the so-called ioniAPi-TOF. The novelty is the use of two hexapoles as ion guides within the APi. In our case, hexapoles can accept and transmit a broad mass range enabling the study of small precursor ions and heavy cluster ions at the same time. Weakly bound cluster ions can easily de-cluster during ion transfer depending on the voltages applied to the ion transfer optics. With the example system of H3O+(H2O)n=0-3, we estimate that cluster ions with higher binding energies than 17 kcal mol−1 can be transferred through the APi without significant fragmentation, which is considerably lower than about 25 kcal mol−1 estimated from the literature for APi-TOFs with quadrupole ion guides. In contrast to the low-fragmenting ion transfer, the hexapoles can be set to a high-fragmenting declustering mode for collision-induced dissociation (CID) experiments as well. The ion transmission efficiency over a broad mass range was determined to be on the order of 1 %, which is comparable to existing instrumentation. From measurements under well-controlled conditions during the CLOUD experiment, we demonstrate the instrument's performance and present results from an inter-comparison with a quadrupole-based APi-TOF.

“…9. Ion count rates are corrected for diffusion losses with the Gormley-Kennedy equation (Bemgård et al, 1996) for both instruments.…”

Section: Mass Window and Comparison To A Quadrupole Based Api-tof Msmentioning

confidence: 99%

Characterisation of the transfer of cluster ions through an Atmospheric Pressure interface Time-of-Flight mass spectrometer with hexapole ion guides

Feil²,

Mutschlechner³

et al. 2019

Preprint

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Abstract. Here we present an alternative approach of an Atmospheric-Pressure interface (APi) Time-Of-Flight mass spectrometer for the study of atmospheric ions and cluster ions, the so-called ioniAPi-TOF. The novelty is the use of two hexapoles as ion guides within the APi. As we will show, hexapoles can accept and transmit a broad mass range enabling the study of small precursor ions and heavy cluster ions at the same time. Weakly bound cluster ions can easily de-cluster during ion transfer depending on the voltages applied to the ion transfer optics. With the example system of H3O+(H2O)n=0–3, we estimate that cluster ions with higher binding energies than 17 kcal/mol can be transferred through the APi without significant fragmentation, which is considerably lower than about 25 kcal/mol estimated from the literature for APi-TOFs with quadrupole ion guides. In contrast to the low fragmenting ion transfer, the hexapoles can be set to a high fragmenting declustering mode for collision-induced dissociation (CID) experiments as well. The ion transmission efficiency over a broad mass range was determined to be in the order of 1 %, which is comparable to existing instrumentation. From measurements under well-controlled conditions during the CLOUD experiment, we demonstrate the instrument's performance and present results from an inter-comparison with a quadrupole based APi-TOF.

Air Pollution

¹

1997

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This review is extracted from the literature from January 1995 to December 1996 and is an extension of literature previously discussed (A1). The major source of information was Chemical Abstracts Selects: Pollution Monitoring and Air Pollution (Books and Reviews).The organization consists of two major divisions: gaseous methods, which have single-letter designations before reference numbers, and aerosol and particulate methods, which have twoletter designations before reference numbers. Areas that are included are listed in the table of contents.The classification and subclassification scheme is not necessarily technique or pollutant specific. An example occurs in the ozone section (B). This section contains articles that are primarily about ozone techniques. However other articles refer to ozone in sampling and spectroscopy sections. Please read other sections which might contain information of interest.

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