Words to Describe photoionization

How photoionization often is described ("________ photoionization")

• multistep
• nuclear
• resonant
• molecular
• step
• single
• simultaneous
• ray
• pressure
• experimental
• laser
• primary
• atomic
• collinear
• induced
• direct
• atmospheric
• solar
• double
• nonresonant
• upstream
• assisted
• stellar
• shell
• effective
• inner
• dissociative
• selective
• electron
• photon
• subsequent
• multiple
• level