Abstract: A hand grip mechanism includes a first member, a second member connected to the first member in a vertically moveable manner, a spring providing a biasing force to lower the second member with respect to the first member, and a hand grip configured by two grip links, each including a grip rotatably connected to the first member, a link rotatably connected to the second member below a connecting portion between the first member and the grip, and first and second connecting shafts each connecting the grip and the link below a connecting portion between the second member and the link. By a pressing operation to squeeze the hand grip against the biasing force of the spring, the grip and link in each grip link rotate relative to each other about the first connecting shaft during initial movement and about the second connecting shaft during final movement.

Abstract: A gas chromatograph mass spectrometer includes a separator that separates a sample, and a mass analyzer that performs mass spectrometry on the sample introduced from the separator, the mass analyzer includes a filament and an ionization chamber into which thermal electrons from the filament and the sample from the separator are introduced, and an opening through which the thermal electrons emitted from the filament pass and which is formed in the ionization chamber or in a member arranged between the ionization chamber and the filament has a maximum diameter of less than 3 mm.

Abstract: A hand grip mechanism includes a first member, a second member connected to the first member in a vertically moveable manner, a spring providing a biasing force to lower the second member with respect to the first member, and a hand grip configured by two grip links, each including a grip rotatably connected to the first member, a link rotatably connected to the second member below a connecting portion between the first member and the grip, and first and second connecting shafts each connecting the grip and the link below a connecting portion between the second member and the link. By a pressing operation to squeeze the hand grip against the biasing force of the spring, the grip and link in each grip link rotate relative to each other about the first connecting shaft during initial movement and about the second connecting shaft during final movement.

Abstract: A sample solution (21) that is a first solvent containing a sample is stored in a first storage section (17). A pseudo matrix solution (22) that is a second solvent, with higher polarity than the first solvent, in which a pseudo matrix is dissolved is stored in a second storage section (18). A suction control unit (191) causes the sample solution (21) in the first storage section (17) and the pseudo matrix solution (22) in the second storage section (18) to be sucked into a syringe (15). An injection control unit (192) causes the sample solution (21) and the pseudo matrix solution (22) to be vaporized in a sample vaporization chamber (12), by causing the sample solution (21) and the pseudo matrix solution (22) sucked into the syringe (15) to be injected into the sample vaporization chamber (12).

Abstract: A column protection gas supply channel (4) is connected to a channel (17) for carrier gas present between a sample vaporization chamber (12) and an MS section (2). During a standby, a column (11) may be protected on the downstream side of a merging section (16) of the column protection gas supply channel (4) and the channel (17) for carrier gas by supplying column protection gas through the column protection gas supply channel (4). At this time, there is remaining carrier gas in the channel (17) for carrier gas on the upstream side of the merging section (16). Accordingly, when carrier gas is then supplied at a time of start of an analysis, a certain amount of carrier gas is already present inside the channel (17). Therefore, the time required to completely replace the column protection gas in the channel (17) by the carrier gas is reduced, and the standby time until the start of the analysis may be reduced.

Abstract: A sample solution (21) that is a first solvent containing a sample is stored in a first storage section (17). A pseudo matrix solution (22) that is a second solvent, with higher polarity than the first solvent, in which a pseudo matrix is dissolved is stored in a second storage section (18). A suction control unit (191) causes the sample solution (21) in the first storage section (17) and the pseudo matrix solution (22) in the second storage section (18) to be sucked into a syringe (15). An injection control unit (192) causes the sample solution (21) and the pseudo matrix solution (22) to be vaporized in a sample vaporization chamber (12), by causing the sample solution (21) and the pseudo matrix solution (22) sucked into the syringe (15) to be injected into the sample vaporization chamber (12).

Abstract: A column protection gas supply channel (4) is connected to a channel (17) for carrier gas present between a sample vaporization chamber (12) and an MS section (2). During a standby, a column (11) may be protected on the downstream side of a merging section (16) of the column protection gas supply channel (4) and the channel (17) for carrier gas by supplying column protection gas through the column protection gas supply channel (4). At this time, there is remaining carrier gas in the channel (17) for carrier gas on the upstream side of the merging section (16). Accordingly, when carrier gas is then supplied at a time of start of an analysis, a certain amount of carrier gas is already present inside the channel (17). Therefore, the time required to completely replace the column protection gas in the channel (17) by the carrier gas is reduced, and the standby time until the start of the analysis may be reduced.