 Hyperpolarized xenon can be used by surface chemists . Normally , it is difficult to characterize surfaces using NMR , because signals from the surface of a sample will be overwhelmed by signals from the far @-@ more @-@ numerous atomic nuclei in the bulk . However , nuclear spins on solid surfaces can be selectively polarized , by transferring spin polarization to them from hyperpolarized xenon gas . This makes the surface signals strong enough to measure , and distinguishes them from bulk signals . 
 Hyperpolarized xenon can be used by surface chemists . Normally , it <a href='drop_aux' title='1'><mark>is</mark></a>difficult to characterize surfaces using NMR , because signals from the surface of a sample will be overwhelmed by signals from the far @-@ more @-@ numerous atomic nuclei in the bulk . However , nuclear spins on solid surfaces can be selectively polarized , by transferring spin polarization to them from hyperpolarized xenon gas . This <a href='uninflect' title='2'><mark>makes</mark></a> the surface signals strong enough to measure , and <a href='uninflect' title='3'><mark>distinguishes</mark></a> them from bulk signals . 
Hyperpolarized xenon can b used by surface chemists . Normally , it difficult to characterize surfaces usin NMR , because signals from the surface of a sample will be overwhelmed by signals from the far @-@ more @-@ numerous atomic nuclei in da bulk . However , nuclear spins on solid surfaces can bbselectively polarized , by transferring spin polarization to them from hyperpolarized xenon gas . This make the surface signals strong enough to measure , and distinguish them from bulk signals .