Photodissociation, surface plasmon enhanced

Nitzan and Brus fust suggested the possibility of siuface plasmon enhanced photochemistry in 1981 [13, 14]. They studied a phenomenological model for a molecule interacting with a small spherical metal nanoparticle that can support a SP resonance when irradiated. The model was derived in detail in a subsequent paper by Gersten and Nitzan [15]. I will thus refer to the model as the Nitzan-Brus-Gerstan or NBG model. The calculations based on the NBG model showed that both UV photodissociation and IR multiphoton absorption could be surface plasmon enhanced [13, 14]. 

Nitzan and Brus developed an analytical formula for the molecular absorption cross section given the model defined above [14]. Figure 9.2 is taken fi"om Ref. [13] and shows the calculated absorption cross section based on the model associated with the photodissociation of I2. (The I2 formed through the absorption process is very short lived.) Photodissociation predicted to be enhanced as the molecule is placed near a silver metal nanoparticle of radius a - 50 nm near the electronic transition resonance position of cat) 22,200 cm . If e eiai(co) is the dielectric fiinction for the metal, a small metal nanoparticle plasmon in air will have its dipolar surface plasmon resonance at frequency <24 such that [1]... 

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