P branch
= P branch
{c}
{title2=$\Delta J=-1$}
The <rovibrational spectroscopy> branch in which absorption lowers the total rotational <angular momentum> quantum number by one. A label $P(J)$ conventionally specifies the lower-state value $J$.
= P branch
{c}
{title2=$\Delta J=-1$}
The <rovibrational spectroscopy> branch in which absorption lowers the total rotational <angular momentum> quantum number by one. A label $P(J)$ conventionally specifies the lower-state value $J$.