Diffusion-limited energy transfer from Tb3+ → Nd3+ and Tb3+ → Ho3+ in DMSO

The energy transfer phenomenon has been studied from Tb³⁺ → Nd³⁺ and Tb³⁺ → Ho³⁺ in DMSO. A diffusion limited dipole-dipole mechanism of energy transfer is suggested for both systems. At high acceptor concentrations, P_da depends linearly on C² consistent with the Fong and Diestler theory of energy transfer. However, at low acceptor concentrations the observations of time evolutions of Tb³⁺ luminescence decay following flash excitation has enabled us to examine diffusion limited energy transfer from Tb³⁺ to Nd³⁺ and Tb³⁺ to Ho³⁺ in DMSO.     

Emission spectra of CH(A 2Δ) from methane in an argon flowing afterglow

The CH A ²ΔX²Π emission was observed in the flowing afterglow reaction of charged species of argon with CH₄. Energetic considerations show that metastable argon ions, Ar^+M(⁴D, ⁴F, ²F, ²G, are plausible candidates, although the contribution of Ar²⁺ cannot be completely excluded. The CH A ²ΔX²Π spectrum was analyzed; the ratio of vibrational populations for the υ′ = 0 and 1 states, P_vib(υ′ = 0), is estimated to be 0.56 ± 0.17, and the effective rotational temperatures are (3.0 ± 1.5) × 10³ and (1.7 ± 0.4) × 10³ K, respectively.