arc spectrum
arc spectrum [SPECT] The spectrum of a neutral atom, as opposed to that of a molecule or an ion; it is usually produced by vaporizing the substance in an electric arc;
designated by the roman numeral I following the symbol for the element, for example,
HeI. { a¨ rk spek trəm }
designated by the roman numeral I following the symbol for the element, for example,
HeI. { a¨ rk spek trəm }