Measurement of negative ion mobility in O<sub>2</sub>at high pressures using a point plate gap as an ion detector

Okuyama, Yui; Kimura, Taro; Suzuki, Susumu

doi:10.1088/0022-3727/45/19/195202

Cited by 20 publications

(14 citation statements)

References 26 publications

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“…The geometric factor K which depends on the charge carriers mobility µ is the slope of the characteristic. The value of µ is not wellknown and we can find in the literature values between 1.1×10 −4 m 2 /(V s) and 4×10 −4 m 2 /(V s) [26][27][28][29]. These discrepancies can result from the model used for mobility calculation and the unknown experiment conditions such as the pressure, the humidity and not filtered ambient air.…”

Section: Current-voltage Characteristicsmentioning

confidence: 87%

Analysis of the Current-Voltage Characteristic during the Corona Discharge in Wires-To-Planes Electrostatic Precipitator under Variable Air Humidity

et al. 2019

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In the present work an experimental investigation has been carried out on the influence of the air humidity or the water vapor injected in the incoming air flow on DC corona discharge parameters in a wire-to-planes electrostatic precipitators. To characterize the behavior of the corona discharge for both positive and negative corona, the current-voltage characteristics are subjected to an analysis using the model of Cooperman which derives the quadratic Townsend law and the general formula proposed by Meng et al. The experimental results show that the discharge current is strongly influenced by the level of air humidity. Moreover, the corona current becomes very small with the applied voltage beyond Hr = 90%, because the particle size is increased by condensation. It was demonstrated that the Coopeman model is reliable to determine the mobility of the charge carriers in this system.

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Section: Current-voltage Characteristicsmentioning

confidence: 87%

Analysis of the Current-Voltage Characteristic during the Corona Discharge in Wires-To-Planes Electrostatic Precipitator under Variable Air Humidity

et al. 2019

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“…The emitted photoelectrons move toward the particles along the electric field; thus, a photoelectron cloud is formed above the particle layers in the equilibrium state [22]. Because the photoelectrons result in air ionization, a negative ion cloud is also formed [23]. The charged particles will be levitated when the electrostatic forces are sufficiently large.…”

Section: Nomenclaturementioning

confidence: 99%

“…Consequently, a photoelectron cloud is formed above the particle layers in the equilibrium state [22]. A negative ion cloud is also formed by air ionization [23]. The acquisition of these negative charges by the levitated particles causes the initial positive charge on the particles to decrease.…”

Section: B Particle Chargesmentioning

confidence: 99%

Charging and Levitation of Particles Using UV Irradiation and Electric Field

Shoyama

Yoshioka

Matsusaka

2022

IEEE Trans. on Ind. Applicat.

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“…Helium was difficult to evacuate, and a small ion inlet aperture (40 µm) had to be used in their experiment; however, this problem may be overcome by using a gated ion inlet. In another example, a pulsed UV light from a discharge source was used to generate photoelectrons in order to ionize the oxygen (by electron attachment) for HP negative‐ion‐mobility spectrometry . Based on these earlier findings, it may be feasible to operate an existing APPI (which is widely available for non‐polar compounds) beyond 1 atm to obtain a higher ion density due to a higher number density of photon‐absorbing molecules within the effective ionization volume generated by the UV source.…”

Section: Super‐atmospheric Pressure Ion Sourcesmentioning

confidence: 99%

Super‐atmospheric pressure ionization mass spectrometry and its application to ultrafast online protein digestion analysis

2016

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Ion source pressure plays a significant role in the process of ionization and the subsequent ion transmission inside a mass spectrometer. Pressurizing the ion source to a gas pressure greater than atmospheric pressure is a relatively new approach that aims to further improve the performance of atmospheric pressure ionization sources. For example, under a super-atmospheric pressure environment, a stable electrospray can be sustained for liquid with high surface tension such as pure water, because of the suppression of electric discharge. Even for nano-electrospray ionization (nano-ESI), which is known to work with aqueous solution, its stability and sensitivity can also be enhanced, particularly in the negative mode when the ion source is pressurized. A brief review on the development of super-atmospheric pressure ion sources, including high-pressure electrospray, field desorption and superheated ESI, and the strategies to interface these ion sources to a mass spectrometer will be given. Using a recent ESI prototype with an operating temperature at 220°C under 27 atm, we also demonstrate that it is possible to achieve an online Asp-specific protein digestion analysis in which the whole processes of digestion, ionization and MS acquisition could be completed on the order of a few seconds. This method is fast, and the reaction can even be monitored on a near-real-time basis.

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Measurement of negative ion mobility in O₂at high pressures using a point plate gap as an ion detector

Cited by 20 publications

References 26 publications

Analysis of the Current-Voltage Characteristic during the Corona Discharge in Wires-To-Planes Electrostatic Precipitator under Variable Air Humidity

Analysis of the Current-Voltage Characteristic during the Corona Discharge in Wires-To-Planes Electrostatic Precipitator under Variable Air Humidity

Charging and Levitation of Particles Using UV Irradiation and Electric Field

Super‐atmospheric pressure ionization mass spectrometry and its application to ultrafast online protein digestion analysis

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Measurement of negative ion mobility in O2at high pressures using a point plate gap as an ion detector

Cited by 20 publications

References 26 publications

Analysis of the Current-Voltage Characteristic during the Corona Discharge in Wires-To-Planes Electrostatic Precipitator under Variable Air Humidity

Analysis of the Current-Voltage Characteristic during the Corona Discharge in Wires-To-Planes Electrostatic Precipitator under Variable Air Humidity

Charging and Levitation of Particles Using UV Irradiation and Electric Field

Super‐atmospheric pressure ionization mass spectrometry and its application to ultrafast online protein digestion analysis

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Measurement of negative ion mobility in O₂at high pressures using a point plate gap as an ion detector