Atmospheric pressure on-site ion source device and working method thereof

An ion source and atmospheric pressure technology, applied in the field of mass spectrometry, can solve the problems of low sensitivity of analytical samples, low generation rate of high-energy particles, narrow gas flow rate range, etc., to achieve good system repeatability, improve ionization efficiency, and easy to focus.

Inactive Publication Date: 2014-10-01
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, in the existing atmospheric pressure on-site ion sources, in the ion generation area, there are deficiencies such as unstable discharge, narrow gas flow rate range, low generation rate of high-energy particles, and easy ignition, and there are low sensitivity, poor repeatability, and spatial resolution when analyzing samples. The efficiency is not high, and it is not easy for mass spectrometry imaging.

Method used

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  • Atmospheric pressure on-site ion source device and working method thereof
  • Atmospheric pressure on-site ion source device and working method thereof

Examples

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Effect test

Embodiment 1

[0034] figure 1 , 2 Schematically provides a simplified structural diagram of the on-site ion source device under atmospheric pressure in the embodiment of the present invention, as figure 1 , 2 As shown, the ion source device includes:

[0035] The first cavity 11, the first cavity has an inlet, and the inside is hollow, such as cylindrical;

[0036] A discharge device, the discharge device is arranged in the first cavity; the discharge device can use a high-voltage electrode, a high-energy ultraviolet lamp or other discharge devices, which are all existing technologies in the field;

[0037] The second cavity 21 is hollow inside and communicates with the first cavity; the ratio R of the inner diameters of the first cavity and the second cavity 1 / R 2 Greater than or equal to 1.5, and less than or equal to 20; the outlet of the second cavity is used as the ion outlet 22; the inner diameter is the diameter of the smallest circle covering the section perpendicular to the a...

Embodiment 2

[0047] An application example of the on-site ion source device under atmospheric pressure and its working method in a mass spectrometry system according to Embodiment 1.

[0048] In this application example, both the first cavity and the second cavity adopt a cylindrical structure, and the third cavity is a hollow frustum structure for connecting the first cavity and the second cavity. The high-voltage electrode is arranged in the first cavity, the diameter of the first cavity is 10 mm, and the length is 20 mm; the diameter of the second cavity is 0.5 mm, and the length is 20 mm. The first cavity, the second cavity, and the third cavity are connected internally, and the internal gas pressure is adjustable, but the product of the pressure P and the length of the first cavity is greater than or equal to 1m·Pa and less than or equal to 20m·Pa .

[0049] The working process of the above-mentioned ion source device includes the following steps:

[0050] Under the action of the hi...

Embodiment 3

[0055] An application example of the on-site ion source device under atmospheric pressure and its working method in a mass spectrometry system according to Embodiment 1.

[0056] In this application example, both the first cavity and the second cavity adopt a cylindrical structure, and the third cavity is a hollow frustum structure for connecting the first cavity and the second cavity. The high-voltage electrode is arranged in the first cavity, the diameter of the first cavity is 4.5 mm, and the length is 10 mm; the diameter of the second cavity is 3 mm, and the length is 5 mm. The first cavity, the second cavity, and the third cavity are connected internally, and the internal gas pressure is adjustable, but the product of the pressure P and the length of the first cavity is greater than or equal to 1m·Pa and less than or equal to 20m·Pa .

[0057] The working process of the above-mentioned ion source device includes the following steps:

[0058] Under the action of the high...

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Abstract

The invention provides an atmospheric pressure on-site ion source device and a working method thereof. The ion source device comprises a first cavity, a discharging device and a second cavity. The first cavity is provided with an inlet and is internally hollow. The discharging device is arranged in the first cavity. The second cavity is internally hollow and communicated with the first cavity. The inner diameter ratio of R1 of the first cavity to R2 of the second cavity is larger than or equal to 1.5 and smaller than or equal to 20. An outlet of the second cavity serves as an ion outlet. The inner diameter is the diameter of the smallest circle of the section which covers the cavity and is perpendicular to the axial direction. A product d*P of the depth d in the first cavity and the pressure intensity P of gas is larger than or equal to 1m Pa and smaller than or equal to 20m Pa. The ion source device has the advantages of being stable in discharging, good in repeatability, high in spatial resolution and sensitivity, capable of analyzing low-concentration samples, and the like.

Description

technical field [0001] The invention relates to mass spectrometry, in particular to an on-site ion source device under atmospheric pressure and a working method thereof. Background technique [0002] At present, in the existing atmospheric pressure on-site ion sources, in the ion generation area, there are deficiencies such as unstable discharge, narrow gas flow rate range, low generation rate of high-energy particles, and easy ignition, and there are low sensitivity, poor repeatability, and spatial resolution when analyzing samples. The efficiency is not high, and the mass spectrometry imaging is not easy. [0003] Therefore, how to provide an on-site ion source under atmospheric pressure with stable discharge and high sensitivity is an urgent technical problem in this field. Contents of the invention [0004] In order to solve the shortcomings in the above-mentioned prior art solutions, the present invention provides an on-site ion source device under atmospheric pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J37/08H01J37/04
Inventor 俞建成闻路红王海星赵鹏林群英
Owner NINGBO UNIV
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