Comb coherence-transfer and cavity ring-down saturation spectroscopy around 1.65μm: kHz-accurate frequencies of transitions in the 2ν3 band of 12CH4

Comb Coherence Transfer (CCT) uses a feed-forward frequency correction to transfer the optical phase of a frequency comb to the beam of a free-running diode laser. This allows to amplify...

Optical coherence transfer mediated by free electrons

We theoretically investigate the quantum-coherence properties of the cathodoluminescence (CL) emission produced by a temporally modulated electron beam. Specifically, we consider the quantum-optical correlations of CL produced by electrons that are previously shaped by a laser field. Our main prediction is the presence of phase correlations between the emitted CL field and the electron-modulating laser, even though the emission intensity and spectral profile are independent of the electron state. In addition, the coherence of the CL field extends to harmonics of the laser frequency. Since electron beams can be focused to below 1 Å, their ability to transfer optical coherence could enable the ultra-precise excitation, manipulation, and spectrally resolved probing of nanoscale quantum systems.

Coherence transfer in two-pulse double quantum (DQ) and five-pulse double- quantum modulation (DQM) sequences in EPR: Orientation selectivity, structural sensitivity and distance measurements

Double-quantum (DQ) coherence transfers in two-pulse DQ and five-pulse DQM (double quantum modulation) EPR pulse sequences, utilized for orientation selectivity and distance measurements in biological systems using nitroxide biradicals, are investigated. Analytical expressions, along with numerical algorithms, for EPR signals are given in full details. Please see manuscript .pdf for full abstract.

Spatially Encoded Transfer of 1H Polarization to 13C for Uniform 1 JCH-Response in HSQC

Two dimensional (2D) NMR display better resolution than one-dimensional (1D) 1H NMR. However, 2D NMR does not display a straightforward quantitative aspect due to J-dependent polarization/coherence transfer. 1D 1H NMR is versatile for quantification; however, it displays significant spectral overlap in biological or organic complex mixtures, which forbids quantification of a large number of signals in 1D 1H NMR. The significant variations in 1H13C scalar couplings, T1, T2, and pulse imperfections are the main problems. Although T1, T2 can be suitably chosen to minimize their adverse effect on quantification, the large variations in 1H - 13C couplings lead to variations in cross peak intensity, which is more influenced by the amount of polarization transfer rather than the quantity of metabolites or amount of analytes in a complex mixture. In the present work, we show that spatial encoding of the polarization transfer periods can be executed in 1H13C HSQC using sweep frequency pulses in the presence of a magnetic field gradient. As a result, uniform transfer of polarization from 1H to 13C over a range of 1H - 13C couplings can be performed, subsequently improving the quantitative aspect of HSQC or improve the intensity of cross-peaks, which are mistuned in regular HSQC

Spatially Encoded Transfer of 1H Polarization to 13C for Uniform 1 JCH-Response in HSQC

Two dimensional (2D) NMR display better resolution than one-dimensional (1D) 1H NMR. However, 2D NMR does not display a straightforward quantitative aspect due to J-dependent polarization/coherence transfer. 1D 1H NMR is versatile for quantification; however, it displays significant spectral overlap in biological or organic complex mixtures, which forbids quantification of a large number of signals in 1D 1H NMR. The significant variations in 1H13C scalar couplings, T1, T2, and pulse imperfections are the main problems. Although T1, T2 can be suitably chosen to minimize their adverse effect on quantification, the large variations in 1H - 13C couplings lead to variations in cross peak intensity, which is more influenced by the amount of polarization transfer rather than the quantity of metabolites or amount of analytes in a complex mixture. In the present work, we show that spatial encoding of the polarization transfer periods can be executed in 1H13C HSQC using sweep frequency pulses in the presence of a magnetic field gradient. As a result, uniform transfer of polarization from 1H to 13C over a range of 1H - 13C couplings can be performed, subsequently improving the quantitative aspect of HSQC or improve the intensity of cross-peaks, which are mistuned in regular HSQC