Abstract: A method of determining a coefficient for converting an analog current value into a pulse count value in an inductively coupled plasma mass spectroscopy apparatus (ICP-MS) is described. The ICP-MS is configured to generate the pulse count value and the analog current value as a signal intensity indicating a density of an element in a sample to be measured.

Abstract: In an atmospheric inductively coupled plasma generating apparatus, impedance matching between a coil for plasma generation and an RF power source is effected at a high speed. A control method and/or condition for the output frequency of an oscillator which supplies a power to the coil for plasma generation or a control method and a control condition for the output power of the oscillator are changed appropriately in accordance with a generation state of a plasma. When a plasma is not generated, the output frequency is controlled according to a first condition and, when a plasma is generated, the output frequency is controlled according to a second condition different from the first condition. When a plasma is not generated, the output power is controlled according to a third condition and, when a plasma is generated, the output power is controlled according to a fourth condition different from the third condition.

Abstract: The present invention performs measurement for determining a P/A coefficient and/or determination of the P/A coefficient after measurement of a standard density sample for density calibration in an ICP-MS. Specifically, after measuring signal intensity of each mass number in the standard density sample, the P/A coefficient is determined from the signal intensity for a mass number having the signal intensity within a P/A coefficient calibration range, while for a mass number having the signal intensity above the calibration range, a voltage applied to an ion lens of the ICP-MS is changed so that the signal intensity becomes within the calibration range, to thereby adjust an ion transmission ratio of the ion lens, and then the P/A coefficient is determined from the signal intensity determined within the calibration range.

Abstract: In an atmospheric inductively coupled plasma generating apparatus, impedance matching between a coil for plasma generation and an RF power source is effected at a high speed. A control method and/or condition for the output frequency of an oscillator which supplies a power to the coil for plasma generation or a control method and a control condition for the output power of the oscillator are changed appropriately in accordance with a generation state of a plasma. When a plasma is not generated, the output frequency is controlled according to a first condition and, when a plasma is generated, the output frequency is controlled according to a second condition different from the first condition. When a plasma is not generated, the output power is controlled according to a third condition and, when a plasma is generated, the output power is controlled according to a fourth condition different from the third condition.

Abstract: A radio frequency amplifier and a method of driving the radio frequency amplifier which are excellent in the controllability at the time of a low power output while keeping the advantage of a high efficiency and give the heating generated by a power loss of such a degree that dewing generated due to over-cooling by the cooling system is not generated at the time of a low power output. The radio frequency amplifier is structured by a variable wave height and a variable wave width pulse wave generating circuit that generates a pulse wave (rectangular wave) having an arbitrary pulse height and pulse width, and a power amplifier that is driven by the rectangular wave.

Abstract: The present invention relates to a radio frequency amplifier and a method of driving the radio frequency amplifier, and an object of the present invention is to provide a radio frequency amplifier and a method of driving the radio frequency amplifier which are excellent in the controllability at the time of a low power output while keeping the advantage of a high efficiency and give the heating generated by a power loss of such a degree that dewing generated due to over-cooling by the cooling system is not generated at the time of a low power output. The radio frequency amplifier is structured by a variable wave height and variable wave width pulse wave generating circuit 11 that generates a pulse wave (rectangular wave) having an arbitrary pulse height and pulse width, and a power amplifier 12 that is driven by the rectangular wave.