JPS6247548A - Mass spectrometer - Google Patents

Abstract

PURPOSE:To permit the easy analysis of a state change by the temp. of a sample, etc. by taking temp. or temp. in conjunction with time at the axis of abscissa and the detected ion intensity at the axis of ordinate and recording the output from a mass spectrometer. CONSTITUTION:A gaseous sample is introduced via a selector valve into a gas chromatograph. The gas is also introduced directly through an interface IF into the mass spectrometer without passing the same through the gas chromatograph via the selector valve. The output from the mass spectrometer is read via an interface A1 into the CPU by which the data of the read signal is displayed like a figure (b) on a printer plotter. The equally spaced scale on the lower side of the base line in the X-axis direction is a temp. scale and the irregularly spaced scale on the upper side is the time scale plotted by the CPU and is irregularly graduated according to the heating up schedule in a gas generator. The change of the analyzing gas with time is displayed in relation with the temp. by these two scales; therefore, the analysis of the state change by the temp. of the material, etc. is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a mass spectrometer suitable for investigating temporal changes in gases generated from a sample, and more particularly to a recording device for analyzing data by mass spectrometry.

When gas analysis is performed continuously using a conventional gas chromatograph mass spectrometer or a general mass spectrometer, not only the gas chromatogram but also records of changes over time in mass spectra are all plotted on the horizontal axis with time or mass scanning. The number of times was measured, and the detected ion intensity was plotted on the vertical axis. However, in gas analysis, it is often more convenient to record temperature on the horizontal axis. For example, when analyzing the gas generated by heating a sample over time, the important analytical information is the relationship between the temperature and the gas generated, i.e., what kind of gas is generated at what temperature the sample is? When the results of mass spectrometry of generated gas are recorded using time as the horizontal axis, it is necessary to convert the time to temperature and examine the analysis record using a separate record of the relationship between time and temperature. It took a lot of time to find out. The same thing can be said about chromatography mass spectrometers where the column temperature is changed over time, and in practice, the recording method is to record temperature on the horizontal axis and also record time. It's convenient.

C.6 Problems to be Solved by the Invention The present invention seeks to provide a mass spectrometer that is convenient for analyzing various phenomena in which changes in gas occur depending on temperature.

Means for solving the near problem The output of the mass spectrometer was recorded by taking the temperature or time together on the horizontal axis and the detected ion intensity on the vertical axis.

E. Since the relationship between the operating temperature and the change in gas can be directly grasped, it becomes easier to analyze changes in the state of the sample due to temperature.

Embodiment FIG. 1 shows an apparatus according to an embodiment of the present invention. In the figure, MS is a mass spectrometer and GC is a gas chromatograph. The gas chromatograph and mass spectrometer are connected via an interface IF such as a molecular separator. A sample gas is introduced into the gas chromatograph via a switching valve V. In addition, a pipe system T is provided that directly introduces the sample gas from the switching valve V into the mass spectrometer without passing through the gas chromatograph. When the switching valve is switched to this pipe system side, the sample gas is directly mass-injected via the interface ■F. Introduced into analyzer MS. The output signal of the mass spectrometer MS is connected to the interface A of the amplifier, A/D converter, etc.
is read into the microcomputer CPU via
U outputs the read signal data to the printer/plotter PP.
and/or output to CR and T for display. P is a temperature sensor whose temperature information is read into the CPU via an interface A2 such as an amplifier and an A/D converter.

S is a gas generating device to be measured, which is not an accessory device to the device of the present invention, but is an arbitrary device, the gas outlet is connected to the gas inlet In of the device of the present invention, and the temperature sensor P is a gas generator. It is set at the sample temperature detection position within the generator. The gas generator S is, for example, like a furnace in a thermal analysis device, and is designed to heat the sample set inside it according to a fixed temperature schedule, and to supply reaction gas as needed. It has become.

The operation when the gas generated from the gas generator S with the above configuration is directly analyzed by the mass spectrometer MS will be described. In this case, the switching valve %V is switched to the lower side of the pipe system, the mass spectrometer repeats mass scanning at a constant period, and the CPU acquires detection output signals of several designated masses of ions. On the other hand, the CPU takes in temperature information from the temperature sensor P, outputs this temperature as a horizontal axis signal to the printer/plotter PP, controls chart feeding (X-axis direction feeding), and outputs the detection output of the specified mass ion to the PP on the vertical axis. Output as a signal and record on multiple channels. FIG. 2 shows the printer plotter recording in this case. The CPU can also plot a time scale on the horizontal axis for this recording. In Figure 2, the evenly spaced scales below the base line in the X-axis direction are temperature scales, and the unevenly spaced scales above are time scales set by the CPU. It has become.

When the apparatus shown in FIG. 1 is used as a gas chromatograph mass spectrometer, the gas generator S is removed, the valve V is switched to the gas chromatograph GC side, and a sample gas is introduced from In. When performing analysis while keeping the column temperature of the gas chromatograph constant, the analysis record should be recorded with time on the horizontal axis and the detected output of all ions and the detection output of some specified masses on the vertical axis. If you do this, you can record the usual total ion chromatogram and mass fragmentogram. When the column temperature is changed according to a predetermined schedule, the analysis record shows time or temperature on the horizontal axis, and a total ion chromatogram or mass fragmentogram is recorded with temperature or time also written.

According to the present invention, changes over time in the gas being analyzed are displayed as a relationship with temperature, so it is useful for analyzing changes in materials due to temperature or changes in catalytic reactions due to temperature. It is very convenient and improves the efficiency of research.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram of an example of an analysis record.

Claims (1)

[Claims] A mass spectrometer equipped with a temperature detection means and capable of recording analysis results as a temperature scale or a temperature scale in which time or the number of mass scans is also indicated on the horizontal axis.