NMR probe component with a gradient chip with a slot for insertion of a sample chip
A nuclear magnetic resonance (NMR) probe component, comprising a microfabricated planar gradient chip ( 1 ), with a substrate thickness d gc ≦3 mm, carrying three micromachined planar partial gradient coils ( 10 a - 10 f ) on each of its two outer surfaces ( 12 a , 13 a ), wherein the partial gradient coils ( 10 a - 10 f ) of the gradient chip ( 1 ) form a three-dimensional gradient system, wherein the gradient chip ( 1 ) has a central guiding and positioning slot ( 15 ) between the two outer surfaces ( 12 a , 13 a ). The probe component also has a sample chip ( 2 ) for carrying an NMR sample at a sample location, with a microfabricated planar RF coil ( 21 ), wherein the sample chip ( 2 ) fits exactly in the guiding and positioning slot ( 15 ) such that in a measurement position, the sample location coincides with the center of the gradient system. The NMR probe component has improved spatial resolution and allows good alignment of the RF coil and the gradient system.
1. A nuclear magnetic resonance (NMR) probe component, comprising:
a microfabricated planar gradient chip having a substrate thickness d gc ≦3 mm and carrying three micromachined planar partial gradient coils on each of two outer surfaces thereof, wherein said partial gradient coils form a three-dimensional gradient system,
said gradient chip having a central guiding and positioning slot between said two outer surfaces; and
a sample chip for carrying an NMR sample at a sample location, said sample chip having a microfabricated planar RF coil, said sample chip fitting exactly in said guiding and positioning slot such that, in a measurement position, a sample location coincides with a center of said gradient system.
2. The NMR probe component of claim 1 , wherein said gradient chip consists at least partially of a material having a thermal conductivity ≧75 W/(mK) or said gradient chip consists at least partially of silicon.
3. The NMR probe component of claim 1 , wherein said gradient chip comprises two outer substrates and an intermediate substrate.
4. The NMR probe component of claim 3 , wherein said two outer substrates consist essentially of silicon and said intermediate substrate consists essentially of glass.
5. The NMR probe component of claim 1 , wherein said slot comprises two opposing guide grooves abutting said sample chip at three side faces when said sample chip is within said slot, wherein said slot has a sample groove, facing the sample location of said sample chip and surrounding said sample chip when said sample chip is within said slot.
6. The NMR probe component of claim 1 , wherein said slot is substantially T-shaped in a cross-section perpendicular to a direction of insertion of said sample chip.
7. The NMR probe component of claim 1 , wherein said gradient system is adapted to produce a magnetic field gradient ≧10 T/m or ≧50 T/m.
8. The NMR probe component of claim 1 , wherein said sample chip comprises coupling means for inductive or capacitive coupling to a probe.
9. The NMR probe component of claim 8 , wherein said coupling means comprises a micromachined planar coupling coil, separated from said RF coil.
10. The NMR probe component of claim 1 , wherein outer surfaces of said gradient chip have etched grooves receiving part of said gradient coils, wherein conducting sections of said gradient coils are deposited within said etched grooves.
11. The NMR probe component of claim 1 , wherein said sample chip has a sample well.
12. An NMR spectrometer having an automated sample chip handling system for feeding sample chips to a probe head, the spectrometer comprising the NMR spectrometer probe component of claim 1 .
13. The NMR spectrometer of claim 12 , wherein the sample chip handling system comprises pneumatic transport means for moving the sample chips using pressurized gas, air, N2, or a noble gas.
14. The NMR spectrometer of claim 12 , wherein the NMR spectrometer is structured for magnetic resonance imaging (MRI) of samples ≦1 mm.