Laser-driven electron recollision is at the heart of the rapidly growing field of attosecond science. The recollision wavepacket is qualitatively described within the strong-field approximation, which commonly assumes tunnelling ionization and plane-wave propagation of the liberated electron in the continuum. However, with increasing experimental sophistication, refinements to this simple model...

Rotationally resolved photoelectron spectra are reported for rovibronically state-selected autoionizing levels of water. These photoelectron spectra are helpful for the spectroscopic assignment of the autoionizing levels and provide considerable dynamical information on the mechanisms for the transfer of energy and angular momentum between the ion core and the Rydberg electron. As a result of a...

Delay of gratification is the ability to forego an immediate indulgence in lieu of a later, greater reward. Past research has shown that using behavioral strategies may help children to delay gratification longer. The current project tests whether children can learn one such strategy, covering the eyes, through imitation. Four-year-olds saw a model delay gratification using a strategy, using no...

It is important to demonstrate the use of plasmas for focusing positron and electron beams at high energy. By reducing the transverse area of colliding beams the plasma optical element affords a potential simplicity for enhancing the luminosity in the interaction region of linear colliders. Focusing of both transverse dimensions as well as both charge states has generated interest in this techn...

HEATING WOOD TO TEMPERATURES considerably above normal seasoning temperatures is the oldest, simplest, and cheapest means now known for stabilizing the dimensions of wood, but the treatment, unfortunately, embrittles the wood significantly (8, 9, 13). Dimensional stabilization of wood with heat has been previously shown to be dependent upon a combination of temperature and time. The time requi...

We report the following results from a decade of infrared radiometry of Io: (1) The average global heat flow is more than -2.5 W rn”z, (2) large warm (s200 K) volcanic regions dominate the global heat flow, (3) small high-temperature (> 300 K) “hotspots” contribute little to the average heat flow, (4) thermal anomalies on the leading hemisphere contribute about half of the heat flow, (5) a subs...

For small excursions of an electron within a continuous focusing ion channel, the phase advance of the socalled betatron oscillations of that electron–equivalent to the number of oscillations per unit length of that electron about the central restoring force of the ion’s space-charge force in the blowout regime–are independent of the (negligible) amplitude of its radial excursion. Here, we comp...

We present a general relativistic framework for studying gravitational effects in quantum mechanical phenomena. We concentrate our attention on the case of ultra-relativistic, spin1/2 particles propagating in Kerr spacetime. The two-component Weyl equation with general relativistic corrections is obtained in the case of a slowly rotating, weak gravitational field. Our approach is also applied t...

We have used the Very Long Baseline Array to measure the trigonometric parallax of several member stars of the Orion Nebula Cluster showing non-thermal radio emission. We have determined the distance to the cluster to be 414 ± 7 pc. Our distance determination allows for an improved calibration of luminosities and ages of young stars. We have also measured the proper motions of four cluster star...

We studied the photoelectron spectra of He atoms resulting from double photoexcitation to autoionizing states by an attosecond xuv pulse in the presence of intense few-cycle Ti:sapphire lasers using the timedependent hyperspherical close-coupling method. In its first application we show that the combination of a weak xuv pulse and an intense infrared laser offers an efficient means for probing ...