If the hardware has been set up properly and if the CP experiment works at 600 MHz, it would be worthwhile to check the line-widths in both proton and carbon spectra. Increase in linewidth at 700 MHz may be due to sample alignment, inadequate rotor speed, chemical exchange effects etc. and may significantly alter the effective relaxation times of protons/carbons. Cross polarization experiments are extremely sensitive to relaxation times of both protons and carbons.

If the hardware has been set up properly and if the CP experiment works at 600 MHz, it would be worthwhile to check the line-widths in both proton and carbon spectra. Increase in linewidth at 700 MHz may be due inadequate rotor speed, chemical exchange effects etc. and may significantly alter the effective relaxation times of protons/carbons. Cross polarization experiments are extremely sensitive to relaxation times of both protons and carbons.carbons. If the relaxation time in the rotating frame is shorter at 700Mhz than at 600MHz, then a shorter CP time may be beneficial.

If the hardware has been set up properly and if the CP experiment works at 600 MHz, it would be worthwhile to check the line-widths in both proton and carbon spectra. Increase in linewidth at 700 MHz may be due to inadequate rotor speed, chemical exchange effects effects, altered sampling of the spectral density function, etc. and may significantly alter the effective relaxation times of protons/carbons. Cross polarization experiments are extremely sensitive to relaxation times of both protons and carbons. If the relaxation time in the rotating frame is shorter at 700Mhz than at 600MHz, then a shorter CP time may be beneficial.

If the hardware has been set up properly and if the CP experiment works at 600 MHz, it would be worthwhile to check the line-widths in both proton and carbon spectra. Increase in linewidth at 700 MHz may be due to inadequate rotor speed, chemical exchange effects, altered sampling of the spectral density function, etc. and may significantly alter the effective relaxation times of protons/carbons. Cross polarization experiments are extremely sensitive to relaxation times of both protons and carbons. If IF the relaxation time in the rotating frame is shorter at 700Mhz than at 600MHz, then repeating the experiment with a shorter CP time may be beneficial.

If IF the hardware has been set up properly and if the CP experiment works at 600 MHz, it would be worthwhile to check the line-widths in both proton and carbon spectra. Increase in linewidth at 700 MHz may be due to inadequate rotor speed, chemical exchange effects, altered sampling of the spectral density function, CSA term, etc. and may be indicative of a significantly alter the altered effective relaxation times of time for protons/carbons. Cross polarization experiments are extremely sensitive to relaxation times of both protons and carbons. IF the relaxation time in the rotating frame is shorter at 700Mhz than at 600MHz, then repeating the experiment with a shorter CP time may be beneficial.

IF the hardware has been set up properly and if the CP experiment works at 600 MHz, it would be worthwhile to check the line-widths in both proton and carbon spectra. Increase in linewidth at 700 MHz may be due to sample heating, inadequate rotor speed, chemical exchange effects, altered CSA term, etc. and may be indicative of a significantly altered effective relaxation time for protons/carbons. Cross polarization experiments are extremely sensitive to relaxation times of both protons and carbons. IF the relaxation time in the rotating frame is shorter at 700Mhz than at 600MHz, then repeating the experiment with a shorter CP time may be beneficial.

IF the hardware has been set up properly and if the CP experiment works at 600 MHz, it would be worthwhile to check the line-widths in both proton and carbon spectra. Increase in linewidth at 700 MHz may be due to sample heating, inadequate rotor speed, chemical exchange effects, altered CSA term, etc. and may be indicative of a significantly altered effective relaxation time for protons/carbons. Cross polarization experiments are sensitive to relaxation times of both protons and carbons. IF the relaxation time in the rotating frame is shorter at 700Mhz than at 600MHz, then repeating the experiment with a shorter CP time time, or at lower magnetic field may be beneficial.