# Rubric for assessing the report for the NV magnetometry research practicum

## Abstract & introduction
- [ ] The research question is clear
- [ ] Abstract is a concise summary of research question and main results

## Theory
The important theory is summarized. The answers to the preparation questions can also be discussed in this section:
- [ ] NV center defect in diamond: diamond lattice and NV orientations
- [ ] Discussed in own words the principle of the NV center's spin-dependent photoluminescence
- Students explain initialization process.
- Explanation of the difference between the PL of the m=0 and m= +/- 1 states
- Student includeds illustration of energy diagram of the NV- with spin transitions and decay channels
- [ ] NV spin Hamiltonian and ESR frequencies
- Derivation of an expression for the eigenvalues of the NV - Hamiltonian
- Calculate the ESR frequencies for a 0- and 90-degree field.
- [ ] Explanation of the expected field for a small cylindrical permanent magnet

## Experimental setup
Explanation and self-made schematic illustration of experimental setup including:
- [ ] A correct enumeration of the required optical elements to excite the NV centers and detect their photoluminescence.
- [ ] Explanation of the use of the microwave generator, its use, operating frequencies, its location.
- [ ] Presence of an external magnetic field:
- Control of the strength at the position of the NV centers
- Discussion of field orientation w.r.t to the orientation of the diamond and the NV centers.

## Results and discussion
- [ ] Discussion of a single ESR measurement of the NV centers in a magnetic field:
- How many peaks are visible and why?
- From the ESR frequencies, the corresponding magnetic field strength and angle are calculated with respect to the different NV families.
- [ ] Discussion of a set of ESR measurements while varying the angle of the magnetic field
- Determine the ESR frequencies as a function of the angle of the magnetic field
- From the ESR frequencies calculate the angle of the field with respect to the different NV families.
- The orientation of the permanent magnet is determined such that its magnetic field is aligned parallel to one of the NV families.
- [ ] Discussion of a set of ESR measurement while varying the distance of the permanent magnet to the diamond
- Determine the ESR frequencies as a function of the distance
- From the ESR frequencies extract the magnetic field strength
- Plot the magnetic field as a function of distance and fit the dependence with an analytical expression that can approximate the field of a permanent magnet.
- Extract the magnetization of the permanent magnet. Is this reasonable?
- The findings are compared against the calculated magnetic field for a cylindrical magnet.
- [ ] All plots have correct labels and units
- [ ] The extracted ESR frequencies / values for the magnetic field are determined up to **significant** numbers.
- [ ] Assessment of the noise level and assess how many iterations are necessary for an accurate measurement and how many you have used for your plots.

## Data analysis
- [ ] At least one ESR spectrum was fitted correctly
- A succesfull lorentzian fit of at leats one ESR spectrum.
- Correct determination op peak center, peak amplitudem, FWHM and the standart diviation errors.
- [ ] The extracted fit parameters have error bars
- The ESR frequencies as a function of the angle of the permanent magnet are plotted with error bars.
- The magnetic field as a function of distance is plotted with error bars.