&lt;title&gt;Low-noise ion source for the implementation of Jet-REMPI: novel on-line monitor for process control&lt;/title&gt;

Oser, Harald; Thanner, R.; Grotheer, Horst-Henning

doi:10.1117/12.224099

Cited by 4 publications

(5 citation statements)

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“…Ions formed from photoelectrons are essentially trapped within this electrode. Again, more details are reported in (Oser et al, a, 1995).…”

Section: Noise Reduction Through Minimization Of Surface Effectsmentioning

confidence: 98%

“…The special design of our ion source is briefly described in the next two sections and in a more detailed account in a paper to be published elsewhere (Oser et al, a, 1995) …”

Section: Experimental General Approach: Rempi-msmentioning

confidence: 99%

“…Extracting the ions from a finite space angle is possible if the beam is "shaped" by an electrostatic Einzellens. The appropriate geometry was again determined by simulation (Oser et al, a, 1995).…”

Section: Increased Ionization Volumementioning

confidence: 99%

“…By using a reflectron TOF, we were able to extend the ionization volume along the mass spectrometer axis. To determine the correct geometry for the ionisation zone the SIMION program was used to calculate ion trajectories and flight times (Oser et al, a, 1995). Due to the symmetry of the ionization zone these calculations also allowed the augmentation of the ionization volume in the direction of the sample beam.…”

Section: Increased Ionization Volumementioning

confidence: 99%

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Jet-REMPI for the Detection of Trace Gas Compounds in Complex Gas Mixtures, a Tool for Kinetic Research and Incinerator Process Control

Oser¹,

Thanner²,

Grotheer³

1996

Combustion Science and Technology

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Flame optimization in incinerators is achievable by feedback control via kinetic modelling and on-line monitoring. On-line monitoring for process control requires a fast, selective and sensitive analytical device. In this paper a REM PI (Resonance Enhanced Multi Photon Ionization) mass spectrometer is presented which combines high sensitivity with very low cross-sensitivity. Consequently, it should be a valuable tool for both kinetic research and for on-line investigation. The sensitivity of the instrument has been increased by shifting the ionization regime close to the continuous portion ("jet") of the sample beam as opposed to the more conventional ionization within the molecular beam. A further gain in sensitivity was achieved by increasing the ionization volume which was made possible by a complete re-design of the ion source. A very low base-line level is achieved by using a geometry which prevents secondary ionization by the collision of ions/electrons with surfaces.These improvements result in an excellent performance from our apparatus which is demonstrated by the dichlorotoluene and naphthalene spectra which were obtained under a variety of conditions. For naphthalene we have now a detection limit of 5 ppt (mole fraction) for a SfN = I. Further developments of the technique are discussed.

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“…Ions formed from photoelectrons are essentially trapped within this electrode. Again, more details are reported in (Oser et al, a, 1995).…”

Section: Noise Reduction Through Minimization Of Surface Effectsmentioning

confidence: 98%

“…The special design of our ion source is briefly described in the next two sections and in a more detailed account in a paper to be published elsewhere (Oser et al, a, 1995) …”

Section: Experimental General Approach: Rempi-msmentioning

confidence: 99%

Section: Increased Ionization Volumementioning

confidence: 99%

Section: Increased Ionization Volumementioning

confidence: 99%

See 2 more Smart Citations

Jet-REMPI for the Detection of Trace Gas Compounds in Complex Gas Mixtures, a Tool for Kinetic Research and Incinerator Process Control

Oser¹,

Thanner²,

Grotheer³

1996

Combustion Science and Technology

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“…For example, Oser et al developed a cone-shaped ion source arrangement, instead of the conventional one that uses parallel plates. 22,33,34 The sensitivity was increased by shifting the ionization regime to the vicinity of the valve. Moreover, ion-electron reactions were minimal, resulting in a low fragmentation.…”

Section: ·1 Sample Inlet Systemmentioning

confidence: 99%

Sensitive and Selective Analysis of Polychlorinated Dibenzo-p-dioxins/Dibenzofurans and Their Precursors by Supersonic Jet/Resonance-Enhanced Multiphoton Ionization/Time-of-Flight Mass Spectrometry

Uchimura

2005

ANAL. SCI.

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Multipass laser mass spectrometer with extreme jet-cooled pulsed gas

Kirihara¹,

Takahashi²,

Kitada³

et al. 2006

Review of Scientific Instruments

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We have developed a photon accumulated laser mass spectrometer that enables us to identify isomers of polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran. This system is comprised of a high temperature ͑230°C͒ pulsed gas injector ͑PGI͒, multimirror multipath system ͑MMS͒, and the conventional time-of-flight mass spectrometer. The PGI induces the formation of a choked supersonic jet gas pulse that cools down to a temperature to restrain fragmentation and reduces vibrational and rotational thermal noises. The results suggest that the excited lifetime numbers and fragment dynamics of these species change completely with jet cooling of molecules. The MMS enhances the soft ionization efficiency ͑by a factor of 1000 over a single path system͒ through photon accumulation by extending the irradiation duration ͑to about 40 ns͒ and volume, and it further minimizes fragmentation by carefully controlling the laser intensity distribution within the ionization volume. For the typical isomer 2,3,4,7,8-pentachlorodibenzofuran, the system achieved a detection threshold ͑S/N ratio= 3͒ of 410 ppq ͑equivalent to 4.4 ng/ N m 3 ͒.

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<title>Low-noise ion source for the implementation of Jet-REMPI: novel on-line monitor for process control</title>

Cited by 4 publications

References 0 publications

Jet-REMPI for the Detection of Trace Gas Compounds in Complex Gas Mixtures, a Tool for Kinetic Research and Incinerator Process Control

Jet-REMPI for the Detection of Trace Gas Compounds in Complex Gas Mixtures, a Tool for Kinetic Research and Incinerator Process Control

Sensitive and Selective Analysis of Polychlorinated Dibenzo-p-dioxins/Dibenzofurans and Their Precursors by Supersonic Jet/Resonance-Enhanced Multiphoton Ionization/Time-of-Flight Mass Spectrometry

Multipass laser mass spectrometer with extreme jet-cooled pulsed gas

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