Capacitively coupled devices and oscillators

A method of sustaining a capacitively coupled plasma comprising:

• introducing a gas flow into a torch body comprising alumina, wherein the gas flow comprises helium gas;
• and
• providing radio frequency energy to the torch body using a capacitive device configured to sustain the capacitively coupled plasma in the torch body comprising the alumina, in which the capacitive device contacts an external surface of the torch body, wherein the capacitive device comprises a wire coil comprising a plurality of coils coupled to each other and positioned external to and coiled around the torch body with the wire coils forming an aperture that receives the torch body, in which the wire coil is configured to couple to an oscillator at a first end of the wire coil to provide the radio frequency energy and contacts the external surface of the torch at a second terminal end of the wire coil to provide capacitive coupling to the torch.