JPH1012187A - Ion trap mass spectrometer - Google Patents

Abstract

(57) [Problem] To provide a mass spectrometer capable of mass spectrometry of a high boiling point component. An end cap forming a trap field is provided.
Disk-shaped ceramic heaters 18 and 19 are attached to the side surfaces of 6 in a state of being in contact with screws 20 respectively. Two power supply lines 21 are connected to the ceramic heaters 18 and 19 respectively. A temperature sensor 22 is located near the ceramic heater 18.
Is attached, and power is supplied to the ceramic heaters 18 and 19 through the power supply line 21 to heat the end caps 5 and 6 and the ring electrode 7 which constitute the trapping field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ion trap mass spectrometer provided with a heating means provided in contact with a side surface of at least one of a plurality of electrodes and a heating means embedded in the electrodes.

[0002]

2. Description of the Related Art Generally, in an ion trap type mass spectrometer, a sample introduced from the outside is ionized in a trapping field and mass separated for analysis. Here, as a general means for heating the trapping field, a heating means that surrounds the entire trapping field in a non-contact manner away from the plurality of electrodes constituting the trapping field is provided, and the trapping field surrounded by the plurality of electrodes is provided. Had been heated.

[0003]

However, in the conventional method, since the heating means does not contact the plurality of electrodes constituting the trapping field, the temperature of the plurality of electrodes does not accurately reach the set temperature. At the same time, the electrodes are not at the same temperature due to the isolation from the heating means. Therefore, when a sample having a boiling point higher than the actual temperature of the plurality of electrodes is introduced from the outside, neutral molecules before being ionized in the trap field will be adsorbed to at least one of the plurality of electrodes, There is a disadvantage that sample ions are not generated.

It is an object of the present invention to provide an ion trap type mass spectrometer capable of mass spectrometry of a high boiling point component.

[0005]

In order to attain the above object, according to the present invention, a heating means provided in contact with a side surface of at least one of a plurality of electrodes constituting a trapping field and an inside of the electrode are provided. An embedded heating means is provided.

[0006] The heating means provided in contact with the side surface of at least one of the plurality of electrodes constituting the trapping field and the heating means embedded in the electrodes bring the plurality of electrodes to the set temperature with high accuracy. Further, by heating each electrode to the same temperature, the mass spectrometry can be performed even when a high boiling component (boiling point of 150 ° C. or more) is introduced into the trapping field.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a block diagram of an ion trap mass spectrometer when performing mass spectrometry. Generally, an ion trap type mass spectrometer has a filament 2 for emitting electrons.
And a filament power supply 1 for heating it. The ion trap is constituted by the ring electrode 7 and the end caps 5 and 6, and the area 15 surrounded by the ring electrode 7 and the end caps 5 and 6 becomes a trap field. When the filament 2 is heated by the filament power supply 1,
Electrons are emitted from the filament 2. At this time, the cylindrical gate electrode 3 is controlled by the filament / lens control device 4 so that the electrons emitted from the filament 2 are opened and closed by the gate as desired. Thereby, electrons are introduced into the area 15 through the opening of the end cap 5. When the high-frequency voltage generator 8 is switched on and a high-frequency voltage is applied between the electrodes 7 and the electrodes 5 and 6, a hyperbolic electric field is generated in the area 15 surrounded by the electrodes 7 and the electrodes 5 and 6. . The electron introduced from the filament 2 causes the sample 1 from the outside to enter the area 1 from the sample introduction path 14.
The sample introduced into 5 is ionized, and the generated ions can be stored in the hyperbolic electric field. In order to detect ions by the external detector 10, an ion lens electrode 16 is provided between the opening of the end cap 6 and the detector 10.
Is provided. The ion lens is opened and closed by controlling the ion lens electrode 16 by the ion lens control device 17,
The sample ions ionized in the zone 15 are detected by the detector 10 from the zone 15 through the opening of the end cap 6. Amplifier 11 receives the current signal collected at the output of detector 10 and converts it to a voltage signal. The voltage signal is stored in the storage device 12 for processing in the processor 13.
It is stored inside. A control signal for controlling the high-frequency voltage generator 8, the filament / lens control device 4, and the ion lens control device 12 is generated by the computer control device 9. By the computer controller 9
In response to a command received from the processor 13, a control signal is sent to the high-frequency voltage generator 8, the filament / lens controller 4, and the ion lens controller 12, and in response to a request from the processor 13, data is sent to the processor 13. Will be sent out.

FIG. 1 is a perspective view showing a state in which a heating means is provided in contact with the side surfaces of end caps 5 and 6 constituting a trapping field. Disc-shaped ceramic heaters 1 are provided on the side surfaces of the end caps 5 and 6 constituting the trapping field, respectively.
Attach 8 and 19 in contact using screws 20. At this time, it is desirable that the ceramic heaters 18 and 19 have the same heating performance. Two power lines 21 for supplying power are connected to the ceramic heaters 18 and 19, respectively. In addition, ceramic heater 1
A temperature sensor 22 near screw 8 is provided with screws 20 for mounting ceramic heater 18 in contact with end cap 6.
Installed by.

FIG. 3 is a block diagram of control for controlling ceramic heaters 18 and 19 which are heating means provided in contact with the side surfaces of the end caps 5 and 6 constituting the trapping field in FIG. . Power is supplied to the ceramic heaters 18 and 19 by the heater power supply 23 to heat the end caps 5 and 6 and the ring electrode 7 constituting the trapping field. A temperature sensor 22 mounted near the ceramic heater 18 constantly monitors the temperature of the ceramic heater 18, and sends a control signal sent from the computer controller 9 and a temperature monitoring signal from the temperature sensor 22 to the temperature controller 24. Thus, the temperature of the ceramic heater 18 can be arbitrarily controlled by turning on or off the heater power supply 23. The ceramic heaters 18 and 19 have the same heating performance.
Since the ceramic heaters 18 and 19 are connected in parallel to each other, the temperature of the ceramic heater 18 and the temperature of the ceramic heater 19 become equal.
And the temperature of 6 becomes uniform, and high-boiling components can be detected with high sensitivity without being adsorbed.

[0010]

According to the present invention, when mass spectrometry of a sample is performed using an ion trap type mass spectrometer, mass spectrometry can be performed even for high boiling components (boiling point of 150 ° C. or higher).

[Brief description of the drawings]

FIG. 1 is a perspective view of a state where a trapping field of an ion trap mass spectrometer according to an embodiment of the present invention is configured and a heating means is provided in contact with a side surface of an electrode.

FIG. 2 is a block diagram of an ion trap mass spectrometer when performing mass spectrometry.

FIG. 3 is a block diagram of temperature control showing the embodiment of the present invention.

[Explanation of symbols]

5, 6 ... end cap, 7: ring electrode, 18, 19
... Senmic heater, 20 ... Screw, 21 ... Power line, 22
... Temperature sensor.

Claims (1)

[Claims] 1. A plurality of electrodes provided so as to surround a trapping field, ionization means for ionizing a sample and storing the ionized sample in the trapping field, and at least one of the plurality of electrodes. In an ion trap mass spectrometer including a voltage application unit that generates a trapping electric field by applying an AC voltage, and a mass analysis unit for the ionized sample from the trapping field, at least one electrode of the plurality of electrodes is used. An ion trap mass spectrometer comprising a heating means provided in contact with a side surface and a heating means embedded in an electrode.