A complementary approach is to swap the helium gas for liquid helium, which has a much higher density. Sótér and colleagues found that this method could be used to measure very narrow lines in the ...
A research team from the Shanghai Astronomical Observatory (SHAO) of the Chinese Academy of Sciences has detected radio recombination lines (RRLs) of ions heavier than helium for the first time, using ...
IT has become a general supposition that the validity of Bohr's theory of the spectra of hydrogen and helium would be definitely proved if certain faint components very close to the hydrogen lines ...
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