Abstract: An atomic absorption spectrophotometer includes a first holder, a fixed portion, and a movable portion. In an inner circumferential surface of the fixed portion, a first female thread portion is formed from an end on a rear side toward a front side in a direction of fitting of the fixed portion to the first holder, and a small-diameter portion having an inner diameter smaller than a minimum diameter of the first female thread portion is formed while it is located on the front side in the direction of fitting with respect to the first female thread portion. In an inner circumferential surface of the movable portion, a second female thread portion having a minimum diameter larger than a maximum diameter of the first female thread portion is formed from an end on the rear side toward the front side in the direction of fitting of the movable portion.

Abstract: A conductive rod body is embedded in an insulative torch adapter into which a plasma torch is fitted so that a leading end protrudes from its outer circumferential surface. Further, a metal plate member electrically connected to a cable line to which a voltage for plasma ignition is applied is attached to a lower holder, and a conductive leaf spring member having a V-shaped cross section is attached to an upper holder. When the torch adapter is placed on the lower holder so that the protruding part of the rod body faces upward and the upper holder is closed to tighten a draw latch, the rod body and the metal plate member are electrically connected via the leaf spring member, and a high voltage for ignition can be applied to the plasma torch.

Abstract: A conductive rod body is embedded in an insulative torch adapter into which a plasma torch is fitted so that a leading end protrudes from its outer circumferential surface. Further, a metal plate member electrically connected to a cable line to which a voltage for plasma ignition is applied is attached to a lower holder, and a conductive leaf spring member having a V-shaped cross section is attached to an upper holder. When the torch adapter is placed on the lower holder so that the protruding part of the rod body faces upward and the upper holder is closed to tighten a draw latch, the rod body and the metal plate member are electrically connected via the leaf spring member, and a high voltage for ignition can be applied to the plasma torch.