Experimental study on an all gas-phase iodine laser using microwave discharge of Cl2/He as a Cl atoms source.
Microwave discharge of a Cl2/He mixture as a simple, clean and efficient Cl atom generator was used for an all gas-phase iodine laser study. Sufficient NCl(a1Delta) was produced through the reaction of HN3+2Cl-->NCl(a1Delta)+HCl+N2. The energy transfer reaction of I(2P3/2)+NCl(a1Delta)-->I(2P1/2)+NCl(X3Sigma) was observed. A population inversion was observed directly by using a 1315 nm tunable diode laser by scanning the entire line shape of the (3,4) hyperfine transition of iodine, and a small signal gain of 5x10(-5) cm-1 was obtained.
Matrix-isolated NCl. Radiative rates for b 1Π+→a 1Δ, b 1Σ+→X 3Σ− and a 1Δ→X 3Σ− in solid argon
Abstract Radiative rates for the b→a, b→X, and a→X transitions in NCl have been determined in solid argon. The rates - corrected for the refractive index - are 520, 260, and 0.27 s −1 . The b→X and a→X rates are in good agreement with calculated rates, whereas the b→a rate is enhanced by five orders of magnitude in the matrix.
Can Centauros or Chirons BE the First Observations of Evaporating Mini Black Holes
We argue that the signals expected from the evaporation of mini black holes — predicted in TeV-gravity models with large extra dimensions, and possibly produced in ultrahigh energy collisions in the atmosphere — are quite similar to the characteristics of the Centauro events, an old mystery of cosmic-ray physics.