5. Consider a compound for which the rate constant for spontaneous emission A is 104 s-1 and the collisional deexcitation rate constant kj can be expressed as kq[M], where kq = 6 10-11 cm3 molec-1 s-1 and [M] is the concentration (in molecules cm-3) of the colliding molecules. a. At what value of [M] is the collisional linewidth equal to the natural linewidth? b. Given that [M] = 2.5 1019 molecule cm-3 at 1 bar of pressure and 298 K, what pressure (in mbar) does your answer from part a correspond to? c. Make a plot of the linewidth vs. [M] between [M] = 0 and [M] = 2.5 1019 molecule cm-3