نتایج جستجو برای: population inversion
تعداد نتایج: 736537 فیلتر نتایج به سال:
The recent demonstration of saturable absorption and negative optical conductivity in the Terahertz range in graphene has opened up new opportunities for optoelectronic applications based on this and other low dimensional materials. Recently, population inversion across the Dirac point has been observed directly by time- and angle-resolved photoemission spectroscopy (tr-ARPES), revealing a rela...
We present theory, simulations and experimental demonstrations of composite 1T pulses for population inversion in coupled spin systems such as occur in solid state NMR. The composite 1T pulses are phase-shifted rf pulse sequences designed to invert spins over a larger range of dipole or quadrupole couplings than a conventional1T pulse, for a given rfpower. We discuss a previously proposed theor...
H E linear arrangement of genes within chromosomes is constant T from generation to generation in each line of descent. The degree of this stability is comparable to that of the gene structure; genes change by mutation, chromosomes change by the occurrence of chromosomal aberrations. Strains and races of the same species, as well as distinct species, may differ in gene arrangement. One of us (S...
We describe a class of continuously phase-modulated radiation pulses that result in coherent population inversion on resonance as well as over a large range of transition frequencies and radiation field strengths. This is a population-inversion analogy to self-induced transparency. Simulations of the inversion properties of' the modulated inversion pulse (MIP) are presented. It is shown that th...
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