Recently, we reported the fullerene modification using neutral-neutral or neutral-ion collision reactions in the two-chamber configuration of the Bio-Nano electron cyclotron resonance ion source (ECRIS) . In our methodology, modified fullerenes can be synthesised in vapor-phase in an ECR plasma, or on a surface of a plasma chamber, and can be characterised by on-line mass spectrometric analysis of the ECRIS beam, or by off-line analyses (e.g. time-of-flight mass spectrometry, liquid chromatography mass spectrometry, etc.). So far, we have successfully synthesised a modified C70 with iron (Fe) and chlorine (Cl) atoms using two individual plasmas: Fe-Cl plasma and C70 plasma.
In a subsequent experiment, shown in this study, we investigated the ion/electron density distributions in the plasma chamber by using electrostatic probe method. We correlated these results with the off-line synthesised material investigations and also with plasma electron simulations in order to collect more information on the mechanism of the synthesis process.
 T. Uchida et. al., Rev. Sci. Instrum. 87 (2016) 02A720.