‎    The Narumi-Katayama index is the first topological index defined by the product of some graph theoretical quantities. Let G be a simple graph. Narumi-Katayama index of G is defined as the product of the degrees of the vertices of G. In this paper, we define the Narumi-Katayama polynomial of G. Next, we investigate some properties of this polynomial for graphs and then, we obtain ...

Excited-state nonadiabatic molecular dynamics is used to study energy transfer in dendrimer building blocks, between two-, three-, and four-ring linear polyphenylene ethynylene units linked by meta-substitutions. Upon excitation, dendrimers with these building blocks have been shown to undergo highly efficient and unidirectional energy transfer. The simulations start by initial vertical excitat...

It is our great honor and pleasure to dedicate this special issue of the Journal Raman Spectroscopy Professor Richard P. Van Duyne (1945–2019). well known for his discovery advancement surface-enhanced scattering (SERS), thereby creating a field research that continues be vibrant over 40 years after its initial discovery. This includes papers cover three main directions related SERS, namely, th...