For 10 points, name this technique that separates ions to find the ratio between charge and its namesake property.
Although not it's related to microwaves, Guan and Marshall compared the Bloch equations to the switching between cyclotron and magnetron motion in one form of this technique. That technique uses an image current and subtracts the cyclotron and magnetron frequencies and applies Fourier transforms to get the cyclotron frequencies of the component particles. Soft laser desorption assists in preparing proteins for this technique, though a better known way uses electricity to disperse aerosols. The effect of electromagnetic fields on (*) charged particles in this technique is described by the combination of the Lorentz force with the centripetal force. Electrospray ionization is one way to create the ions needed for this and the most abundant particle type is denoted by the base peak. For 10 points, name this technique that separates ions to find the ratio between charge and its namesake property.
Although not it's related to microwaves, Guan and Marshall compared the Bloch equations to the switching between cyclotron and magnetron motion in one form of this technique.
mass spectrometry [accept mass spectroscopy]