Collisional Quenching of C_2(d^3Π_g) and C^3(A^1〜Π_u) and Its Application to the Estimation of Absolute Particle Density in Laser-Ablation Carbon Plumes

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Collisional quenching of laser-excited C_2(d^3Π_g) and C^3(A^1〜Π_u) has been investigated experimentally in carbon plumes produced by laser ablation of a graphite target in ambient He gas. The radiative lifetime of C_2(d^3Π_g) was evaluated to be 115 ns. Collision with He did not affect the lifetime of C_2(d^3Π_g) at pressures less than 5 Ton. On the other hand, collision with He reduced the lifetime of C^3(A^1〜Π_u) at pressures higher than 0.5 Ton. The radiative lifetime of C^3(A^〜Π_u) and the rate coefficiein for the collisional quenching were evaluated to be 2l0 ns and 3.0 x 10^<-11> cm^3/s, respectively. Several microseconds after the irradiation of the ablation laser pulse, collision with particles ejected from the target reduced the lifetimes of both C_2(d^3Π_g) and C^3(A^〜Π_u). From the reduced lifetime of C^3(A^1〜Π_u), we estimated the absolute particle density in the plume.
社団法人応用物理学会の論文
2002-09-15