WIP add Yb quantum defects

Author: johannes-moegerle

src/rydstate/species/ytterbium.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from pathlib import Path
 from typing import ClassVar
 
@@ -60,3 +62,33 @@ class Ytterbium174(_YtterbiumAbstract):
         None,
         str(rydberg_constant.u),
     )
+
+    # -- [1] Phys. Rev. X 15, 011009 (2025)  # taken from MQDT.jl for now, check reference
+    # -- [2] Phys. Rev. Lett. 128, 033201 (2022) # taken from MQDT.jl for now, check reference
+    # -- [3] Kuroda 2025, https://arxiv.org/abs/2507.11487
+    #        Microwave spectroscopy and multi-channel quantum defect analysis of ytterbium Rydberg states
+    #        see Table S1 - S6
+    #        Isotope Yb174
+
+    _quantum_defects: ClassVar = {
+        # singlet
+        (0, 0.0, 0): (0.355101645, 0.277673956, 0.0, 0.0, 0.0),  # [3]
+        (1, 1.0, 0): (3 + 0.92271098, 2.6036257, 0.0, 0.0, 0.0),  # todo [3] but mixture
+        (2, 2.0, 0): (0.729513646, -0.0377841183, 0.0, 0.0, 0.0),  # todo [3] but mixture
+        (3, 3.0, 0): (0.276158949, -12.7258012, 0.0, 0.0, 0.0),
+        (4, 4.0, 0): (-0.08222676, 0.0, 0.0, 0.0, 0.0),
+        # triplet
+        (0, 1.0, 1): (0.4382, 4, -1e4, 8e6, -3e9),
+        (1, 0.0, 1): (3 + 0.953661478, -0.287531374, 0.0, 0.0, 0.0),  # [3]
+        (1, 1.0, 1): (3 + 0.98208719, -5.4562725, 0.0, 0.0, 0.0),  # todo [3] but mixture
+        (1, 2.0, 1): (3 + 0.925150932, -2.69197178, 66.7159709, 0.0, 0.0),  # [3]
+        (2, 1.0, 1): (0.75258093, 0.3826, -483.1, 0.0, 0.0),
+        (2, 2.0, 1): (0.752292223, 0.104072325, 0.0, 0.0, 0.0),  # todo [3] but mixture
+        (2, 3.0, 1): (0.72902016, -0.705328923, 829.238844, 0.0, 0.0),  # [3]
+        (3, 2.0, 1): (0.0718252326, -1.00091963, -106.291066, 0.0, 0.0),  # [3]
+        (3, 3.0, 1): (0.0715123712, -0.768462937, 0.0, 0.0, 0.0),
+        (3, 4.0, 1): (0.0839027969, -2.91009023, 0.0, 0.0, 0.0),  # [3]
+        (4, 3.0, 1): (0.0260964574, -0.14139526, 0.0, 0.0, 0.0),  # [3]
+        (4, 4.0, 1): (-0.08222676, 0.0, 0.0, 0.0, 0.0),
+        (4, 5.0, 1): (0.02529201, -0.11588052, 0.0, 0.0, 0.0),  # [3]
+    }