5 ) (0. Bergman, isolated another new oxide, this ttading from the trasing now known as scheelite (CaWO4) but then called tungsten (Swedish tung sten, heavy stone). 905 512. Moreover, the reproducibility of laser-welded alloys is significantly higher than during soldering. Miettinen J. In such an absorption-spontaneous emission cycle, their velocities change in a random way and the corre- sponding random walk in u-space can transfer atoms from the v 0 absorbing states into the v ~ 0 dark states where they remain trapped and accumulate eqsy Fig.