The researchers used what's called an ion microscope to compare the amount of normal hydrogen in the moon rocks to the amount of the hydrogen isotope deuterium, which carries an extra neutron.

The researchers used what’s called an ion microscope to compare the amount of normal hydrogen in the moon rocks to the amount of the hydrogen isotope deuterium, which carries an extra neutron.

An experiment was conducted to study the high-temperature annealing characteristics of polysilicon films using atomic force microscope, secondary ion mass spectroscopy and probe.