Later that year, English astronomer Joseph Lockyer observed
the same spectral line, wrote a paper and also sent it to the French Academy of Sciences.
Not exact matches
If the atoms are excited, they emit these
same wavelengths, hence one can determine precisely which
spectral lines belong to which element.
At the
same time, the new model itself is so general that it will offer an interesting starting point for the search for dark matter even if it turns out that the
spectral line discovered in 2014 has a different origin.
Empirical evidence using spectroscopy proves that a gas does not absorb spontaneous emission from a body which is significantly cooler than it, but it does absorb (and
spectral lines thus appear) when the
same body is made warmer than the gas.
On the other hand, once water is present, its IR
spectral lines overlap with those of CO2 and make CO2 less potent a greenhouse gas — for the
same reason why the temperature dependence on CO2 concentration becomes logarithmic: the previous molecules have already done much of the effect, anyway.
I also understand to about the
same extent, how those
spectral lines can have a «fine structure» producing several
lines instead of one; due to refinements first proposed by Arnold Sommerfeld and others.