Numerical solutions of the time-dependent Schrödinger equation for a 1Dmodel non-Born-Oppenheimer H 2 ϩ are used to illustrate the nonlinear nonperturbative response of molecules to intense (I Ն 10 13 W/cm 2 ), ultrashort (t Ͻ 10 fs) laser pulses. Molecular high-order harmonic generation (MHOHG) is shown to be an example of such response and the resulting nonlinear photon emission spectrum is shown to lead to the synthesis of single attosecond (10 Ϫ18 s) pulses. Application of such ultrashort pulses to the H 2 ϩ system results in localized electron wavepackets whose motion can be detected by asymmetry in the photoelectron spectrum generated by a subsequent probe attosecond pulse, thus leading to measurement of electron motion in molecules on the attosecond time scale.

Abstract. In this investigation, we consider wireless powered relaying systems KeywordsAmplify-and-forward, decode-and-forward, throughput, channel state information, outage probability, cooperative network, bit error rate, energy harvesting

Under the impact of co-channel interference (CCI) at two source nodes and the relay, we investigate the performance of dual-hop amplify-and-forward (AF) relaying networks. In terms of energy harvesting, the power-constrained relay first scavenges energy from the received signal and CCI signals then amplifies them and forwards them to the destination. In particular, we provide closed-form expressions for outage probability and bit error ratio (BER) to easily analyse the system performance. In this paper, the impact of distinct interference power level and the number of CCIs are derived. Monte Carlo simulations are used to provide expressions related to outage probability performance. It is confirmed that energy efficiency at the relay can be enhanced due to several advantages of CCI signals which can also prolong the life expectancy of relaying systems.

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