Image (IMAGE) Science China Press Caption Instrumentation and mass spectrometry observation. A Representative size distribution of the naked Con clusters. B/C The mass spectra after reaction of the Con clusters with different amounts of 20% O2/He introduced into the flow tube (200 μs and 250 μs) and with varying pulse widths controlled by the pulse valve. The Con and ConOm clusters are ionized by a ps-pulsed deep-ultraviolet 177.3 nm laser. Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.