CN201804838U - Electron transport device for internal ion source mass spectrograph - Google Patents
Electron transport device for internal ion source mass spectrograph Download PDFInfo
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- CN201804838U CN201804838U CN2009201985289U CN200920198528U CN201804838U CN 201804838 U CN201804838 U CN 201804838U CN 2009201985289 U CN2009201985289 U CN 2009201985289U CN 200920198528 U CN200920198528 U CN 200920198528U CN 201804838 U CN201804838 U CN 201804838U
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Abstract
The utility model relates to an electron transport device for an internal ion source mass spectrograph, which comprises a power supply; an electrode a, an electrode b and an electrode c are arranged in sequence on one side of an electron source, holes convenient for electron currents generated by the electron source to pass are formed on the electrode a, the electrode b and the electrode c, and the electrodes are separated from one another; the electric potential Va of the electrode a and the electric potential Vc of the electrode c are both higher than the electric potential of the electron source; the electric potential Vb of the electrode b changes with the change in phase; and a current stabilization module for stabilizing currents passing through the electron source is further provided. The electron transport device has the advantages of stable outgoing electron currents and small baseline noise.
Description
Technical field
The utility model relates to the transmission of electronics in the mass spectrometer, especially a kind of means of electronic transmission that is used for internal ion-source mass spectrometer.
Background technology
Mass spectrometry mainly is to realize sample is carried out qualitative and quantitative a kind of method by the analysis to the sample ions mass-to-charge ratio.Mass spectrometric basic composition all comprises ion source, mass analyzer, detector and vacuum system.Ionogenic effect is with sample ionization to be analyzed, obtains having the ion of sample message.
By the spatial division at ionization process place, ion source can be divided into internal ion-source and outer ion source.Wherein, ionization process is finished in mass analyzer is called internal ion-source, electronics enters mass analyzer inside by a transmitting device, this transmitting device is used for realizing that electronics enters mass analyzer in ionization process, and guarantees that in the nonionic process electronics can not enter mass analyzer.
At present, general way is an electrode to be set as transmitting device, as shown in Figure 1 between electron source and mass analyzer.By the electromotive force on the change electrode, thereby whether the electron stream that the decision electron source produces passes through.
Above-mentioned transmitting device mainly contains following deficiency:
1, the possibility that exists electronics or ion to leak causes the noisy base line of spectrogram bigger.
2, very unstable from the electron stream of transmitting device outgoing, and aging along with electron source (as filament), electron stream has the trend that reduces gradually, as shown in Figure 2.
The utility model content
In order to solve above-mentioned deficiency of the prior art, the utility model provide a kind of outgoing electron stream stable, do not have electronics or ion leaks, noisy base line is a little means of electronic transmission that is used for internal ion-source mass spectrometer.
For achieving the above object, the utility model adopts following technical scheme:
A kind of means of electronic transmission that is used for internal ion-source mass spectrometer comprises power supply;
Side at electron source sets gradually electrode a, electrode b and electrode c, and electrode a, electrode b and electrode c are provided with is convenient to the hole that electron stream that electron source produces passes through, and isolates mutually between each electrode;
Electromotive force V on the electrode a
a, the electromotive force V on the electrode c
cAll be higher than the electromotive force on the electron source; Electromotive force V on the electrode b
bDifference with the stage changes;
Be used to make the current stabilization module of current stabilization of electron source of flowing through.
As preferably, described electrode a, electrode b and electrode c are coaxial.
Further, the electrical potential difference between electrode a and electron source is fixed.
Further, described current stabilization module comprises current measurement module and feedback control module.
As preferably, the electromotive force V on the electrode c
cBe higher than the electromotive force V on the electrode a
a
Compared with prior art, the utlity model has following beneficial effect:
1, stable from the electron stream of transmitting device outgoing.
By the electric current of monitoring stream, guarantee the current stabilization of electron source of flowing through by feedback again, thereby guarantee stable from the electron stream of transmitting device outgoing through electron source.
By the electromotive force on the change electrode b, thereby whether the electron stream that the decision electron source produces passes through, and has stopped the leakage at nonionic stage electronics.
2, apply high potential on the electrode c, can effectively stop passing of (in electronic transmission process, molecular ionization produces) ion, reduced noisy base line, help to improve the accuracy of subsequent analysis.
Description of drawings
Fig. 1 is the structural representation of means of electronic transmission in the prior art;
Fig. 2 flows schematic diagram over time for the outgoing electron of transmitting device among Fig. 1;
Fig. 3 is the structural representation of the utility model means of electronic transmission;
Fig. 4 is the cutaway view of electrode among the embodiment;
Fig. 5 is the A-A sectional view of electrode among Fig. 4;
Fig. 6 is the working timing figure of the utility model means of electronic transmission;
Fig. 7 is that the electron stream from the transmitting device outgoing changes schematic diagram in time.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further details.
Embodiment
As Fig. 3, Fig. 4, shown in Figure 5, a kind of means of electronic transmission that is used for internal ion-source mass spectrometer comprises power supply, electrode a, electrode b, electrode c and current stabilization module.
Present embodiment adopts filament as electron source.Certainly can also adopt other electron source, these all are the knowledge of this area, do not repeat them here.
Described electrode a, electrode b and electrode c are by axially arranging successively, and the axle center is on same straight line, and above-mentioned electrode is arranged on a side of electron source, and isolate mutually.Above-mentioned electrode is provided with is convenient to the hole that electron stream passes through, and the direction in hole is identical.Described hole is an arbitrary shape, as shapes such as triangular prism, quadrangular, cylinders.As Fig. 4, shown in Figure 5, the hole on the described electrode a is triangular prism shaped, and the hole on the electrode b is a four prism type, and the hole on the electrode c is cylindrical.
Described power supply is respectively electron source, above-mentioned three electrode power supplies, as shown in Figure 6, and the electromotive force V on the electrode a
aBe higher than the electromotive force on the electron source, electrical potential difference is between the two fixed; Electromotive force V on the electrode c
cBe higher than the electromotive force V on the electrode a
a, electrical potential difference is between the two fixed; Electromotive force V on the electrode b
bDifference with the stage changes, and as in the ionization stage, applies high potential, and the electron stream that electron source is produced passes through; In the nonionic stage, apply low potential, what block electrons flowed passes through.
Described current stabilization module comprises current measurement module, feedback control module, by the electric current of monitoring stream through electron source, and makes the current stabilization of the electron source of flowing through by feedback.
The working method of above-mentioned means of electronic transmission is:
Power supply is respectively electron source, above-mentioned three electrode power supplies, and as shown in Figure 6, electrode a goes up and is high potential V
a, being higher than the electromotive force on the electron source, electrical potential difference is between the two fixed; Electrode c goes up and is high potential V
c(as 40V) is higher than the electromotive force V on the electrode a
a, electrical potential difference is between the two fixed;
In the ionization stage, electrode b goes up and is high potential V
B1(as 50V), the electron stream that electron source produces passes the hole on electrode a, electrode b and the electrode c, and electrode c has stopped passing of ion;
In the nonionic stage, electrode b goes up and is low potential V
B2(as-50V), V
B2＜V
B1, electrode b has stopped passing of electron stream that electron source produces, electrode c stopped passing of ion;
In the above-mentioned stage, form stable electric field between electrode a and electron source; The current measurement module monitoring stream makes the current stabilization of the electron source of flowing through again through the electric current of electron source by feedback control module, make electron source produce stable electron stream, and is promptly stable from the electron stream of electrode c outgoing in the ionization stage, as shown in Figure 7;
Electrode c goes up and keeps high potential, has stopped passing of (in electronic transmission process, molecular ionization produces) ion, thereby has reduced noisy base line.
Above-mentioned execution mode should not be construed as the restriction to the utility model protection range.Key of the present utility model is: three electrodes that set gradually mutual isolation in a side of electron source, be respectively be used for and electron source between form the electrode a of electric field, be used to control the electrode b whether electron stream that electron source produces passes through, be used for the electrode c that blocks ions is passed through, be provided with on above-mentioned three electrodes and be convenient to the hole that electron stream that electron source produces passes.Under the situation that does not break away from the utility model spirit, any type of change that the utility model is made all should fall within the protection range of the present utility model.
Claims (5)
1. a means of electronic transmission that is used for internal ion-source mass spectrometer comprises power supply; It is characterized in that:
Side at electron source sets gradually electrode a, electrode b and electrode c, and electrode a, electrode b and electrode c are provided with is convenient to the hole that electron stream that electron source produces passes through, and isolates mutually between each electrode;
Electromotive force V on the electrode a
a, the electromotive force V on the electrode c
cAll be higher than the electromotive force on the electron source; Electromotive force V on the electrode b
bDifference with the stage changes;
Be used to make the current stabilization module of current stabilization of electron source of flowing through.
2. device according to claim 1 is characterized in that: described electrode a, electrode b and electrode c are coaxial.
3. device according to claim 1 is characterized in that: the electrical potential difference between electrode a and electron source is fixed.
4. according to claim 1 or 2 or 3 described devices, it is characterized in that: described current stabilization module comprises current measurement module and feedback control module.
5. according to claim 1 or 2 or 3 described devices, it is characterized in that: the electromotive force V on the electrode c
cBe higher than the electromotive force V on the electrode a
a
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201985289U CN201804838U (en) | 2009-09-30 | 2009-09-30 | Electron transport device for internal ion source mass spectrograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201985289U CN201804838U (en) | 2009-09-30 | 2009-09-30 | Electron transport device for internal ion source mass spectrograph |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201804838U true CN201804838U (en) | 2011-04-20 |
Family
ID=43874341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201985289U Expired - Fee Related CN201804838U (en) | 2009-09-30 | 2009-09-30 | Electron transport device for internal ion source mass spectrograph |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201804838U (en) |
-
2009
- 2009-09-30 CN CN2009201985289U patent/CN201804838U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20130930 |