electron impact desorption
electron impact ion source
electron impact mass spectra
Electron Impact Mass Spectrometry
Electron Ionization Mass Spectrometry
electron ionization mass spectrometry EI-MS
electron ionization mass spectrometry(EI-MS)
电子电离质谱(EI-MS)
电喷雾电离质谱(ESI-MS)
negative ion electron impact mass spectra
Thermal desorption electron ionization mass spectra
gas chromatography-electron impact ionization mass