Thermal desorption low temperature plasma（TD-LTP）ion source is a ambient ion source with high sensitivity and rapid detection.On this basis

TD-LTPI source is improved by combining thermal desorption technology with inverse-voltage LTP（ILTP）.At the same time

the waveform generator circuit is designed to generate square

sine and triangle waves.The experimental results show that the power consumption of TD-LTPI source is less than 2 μW at 40 kHz and 6.5 kV

p-p

square wave voltage.Under the same conditions

sine and triangular waves need two orders of magnitude more power than the square wave to reach the same peak-to-peak value.T

he plasma generated under the excitation of square wave can obtain the strongest mass spectrum signal intensity when used to detect DINP and DIDP

which is slightly stronger than sine wave.However

both the fragment abundance and relative abundance of square wave were higher than those of sine wave

and the relative abundance of fragment ion is only close to that of triangle wave.Therefore

sine wave is still a robust power supply choice for mass spectrometry ion sources at present

but square wave with low power consumption and high energy has great development potential in future mass spectrometers with energy saving needs.