Patent Number: 
Section: claims

1. An ion beam machining and observation device comprising:a vacuum chamber and a gas supply mechanism to introduce gas into the vacuum chamber, a gas field ion source to generate gas ions in the vacuum chamber, a sample chamber for storing a sample, and an ion beam irradiation column connected to the vacuum chamber to extract an ion beam from the gas field ion source and irradiate the ion beam onto the sample:wherein the gas supply mechanism includes at least two gas introduction systems, each system having a gas cylinder, a gas volume control valve and a stop valve; andfurther comprising:a gas switching control unit for controlling the gas volume control valve of each system to set up gas pressure conditions for the vacuum chamber, and the stop valve of each system to switch the kind of gas being introduced into the vacuum chamber;wherein the gas switching control unit has a control unit to control formation of a pyramid structure of atoms at an apex of an emitter tip of the gas field ion source after the gas switching control unit switches the kind of gas being introduced into the vacuum chamber by the stop valve of each system. 2. The device according to claim 1, wherein the forming of the pyramid structure includes coating palladium or platinum and annealing. 3. The device according to claim 1, wherein the gas switching control unit switches the kind of a gas ion beam used for machining the sample and the kind of a gas ion beam used for observing the sample, and the kind of a gas ion beam used for machining is neon gas, argon gas, krypton gas or xenon gas. 4. The device according to claim 3, wherein the gas switching control unit uses hydrogen gas ion beam or helium ion beam during observing. 5. The device according to claim 1, wherein each of the gas introduction systems includes a needle valve to regulate a flow rate of gas to the vacuum chamber; and further comprising:a control unit to set gas inflow amount conditions of the vacuum chamber by the needle valve of each system. 6. The device according to claim 5, wherein the gas supply mechanism includes a first gas introduction system in which the vacuum chamber and a first needle valve are connected with a first tube and the kind of a gas ion beam used for machining the sample is introduced, and a second gas introduction system in which the vacuum chamber and a second gas introduction system in which the vacuum chamber and a second needle valve are connected with a second tube and the kind of a gas ion beam used for observing the sample is introduced. 7. An ion beam machining and observation device comprising:a vacuum chamber and a gas supply mechanism to introduce gas into the vacuum chamber, a gas field ion source to generate gas ions in the vacuum chamber, a sample chamber for storing a sample, and an ion beam irradiation column connected to the vacuum chamber to extract an ion beam from the gas field ion source and irradiate the ion beam onto the sample;wherein the gas supply mechanism includes at least two gas introduction systems, each system having a gas cylinder, a gas volume control valve and a stop valve; andfurther comprising:a gas switching control unit for controlling the gas volume control valve of each system to set up gas pressure conditions for the vacuum chamber, and the stop valve of each system to switch the kind of gas being introduced into the vacuum chamber;wherein the gas switching control unit has a control unit to control field evaporation of a pyramid structure of atoms at an apex of an emitter tip of the gas field ion source after the gas switching control unit switches the kind of gas being introduced into the vacuum chamber by the stop valve of each system. 8. An ion beam machining and observation device comprising:an ion source generating at least two kind of gas ions having different mass numbers, an ion beam irradiation column to extract an ion beam from the ion source and irradiate the ion beam onto the sample, a control unit to control the ion beam irradiation column;wherein the control unit has a machining control unit to control the irradiation of the gas ions with relatively larger mass numbers of the at least two kinds of gas ions onto the sample in the case of machining a cross section perpendicular to the surface of the sample, and an observation control unit to control the irradiation of the gas ions with relatively smaller mass numbers of the at least two kinds of gas ions onto the cross section of the sample in the case of observing the cross section of the sample. 9. The device according to claim 8, wherein the gas ions with relatively larger mass numbers are gas ions containing at least one or argon, xenon, krypton, neon, oxygen, and nitrogen, and the gas ions with relatively smaller mass numbers are hydrogen gas ions or helium gas ions or a mixture thereof. 10. The device according to claim 8, wherein the ion source is a gas field ion source. 11. The device according to claim 10, wherein the gas ions with relatively larger mass numbers are gas ions containing at least one of argon, xenon, krypton, neon, oxygen, and nitrogen, and the gas ions with relatively smaller mass numbers are hydrogen gas ions or helium gas ions or a mixture of thereof. 12. An ion beam machining and observation device comprising:a vacuum chamber and a gas supply mechanism to introduce gas into the vacuum chamber, a gas field ion source to generate gas ions in the vacuum chamber, a sample chamber for storing a sample, and an ion beam irradiation column connected to the vacuum chamber to extract an ion beam from the gas field ion source and irradiate the ion beam onto the sample;wherein the gas supply mechanism includes at least two gas introduction systems, each system having a gas cylinder, a gas volume control valve and a stop valve; andfurther comprising:a gas introduction control unit for controlling the gas volume control valve of each system to set up gas pressure conditions for the vacuum chamber, and the stop valve of each system to mix at least two kinds of gases and introduce the mixed gas into the vacuum chamber,wherein the gas introduction control unit has a control unit to control formation of a pyramid structure of atoms at an apex of an emitter tip of the gas field ion source after the gas switching control unit switches the kind of gas being introduced into the vacuum chamber by the stop valve of each system.