Ion trap mass spectrometry on a comet nucleus: the Ptolemy instrument and the Rosetta space mission

Todd, John F. J.; Barber, Simeon J.; Wright, Ian P.; Morgan, Geraint H.; Morse, Andrew D.; Sheridan, Simon; Leese, Mark R.; Maynard, Jon; Evans, Suzanne T.; Pillinger, Colin T.; Drummond, Duncan L.; Heys, Samantha C.; Huq, S. Ejaz; Kent, Barry J.; Sawyer, Eric C.; Whalley, Martin S.; Waltham, Nicholas R.