This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
SpectroscopyResearch . Atomic weights redetermined by mass spectrometry National Institute of Standards and Technology National Institute of Standards and Technology PDUSGovNIST PDUSGov National Bureau of Standards National Institute of Standards and Technology Spectroscopy Images of mass spectrometers