Mass spectrometric imaging of brain tissue by time-of-flight secondary ion mass spectrometry - How do polyatomic primary beams C<sub>60</sub><sup>+</sup>, Ar<sub>2000</sub><sup>+</sup>, water-doped Ar<sub>2000</sub><sup>+</sup>and (H<sub>2</sub>O)<sub>6000</sub><sup>+</sup>compare?
Rapid communications in mass spectrometry/RCM. Rapid communications in mass spectrometry