ion spectroscopy ion scattering Rutherford backscattering spectroscopy heavy ion scattering spectrometry RBS HE ISS HEIS high-energy ion scattering spectroscopy heavy ion scattering spectroscopy heavy-ion scattering spectrometry HE-IS high-energy ion scattering spectrometry backscattering spectroscopy Rutherford scattering spectrometry Rutherford scattering spectroscopy heavy-ion scattering spectroscopy HE-ISS CHMO:0000434 Rutherford backscattering spectrometry HE IS HEISS Spectroscopy where the sample is bombarded with He+ or H+ ions (500–1500 eV) and the energies and positions of any backscattered ions are detected.