diff --git a/atomic_physics/ions/ba133.py b/atomic_physics/ions/ba133.py
index 9441094..e639ea2 100644
--- a/atomic_physics/ions/ba133.py
+++ b/atomic_physics/ions/ba133.py
@@ -9,7 +9,8 @@
 
 References:
 [1] - A. Kramida, NIST Atomic Spectra Database (ver. 5.9) (2021)
-[2] - A. A. Madej and J. D. Sankey, Phys. Rev. A 41, 2621, (1990)
+[2] - Zhiqiang Zhang, K. J. Arnold, S. R. Chanu, R. Kaewuam,
+ M. S. Safronova, and M. D. Barrett Phys. Rev. A 101, 062515 (2020)
 [3] - N. Yu, W. Nagourney, and H. Dehmelt, Phys. Rev. Lett. 78, 4898 (1997)
 [4] - N. J. Stone, Table of nuclear magnetic dipole and electric
   quadrupole moments, Atomic Data and Nuclear Data Tables, Volume 90,
@@ -106,7 +107,7 @@ def __init__(
             "1762": ap.Transition(
                 lower=S12,
                 upper=D52,
-                A=29e-3,  # [2]
+                A=1 / 30.14,  # [2]
                 freq=2 * np.pi * 170126433920702.56,
             ),
             "2051": ap.Transition(
diff --git a/atomic_physics/ions/ba135.py b/atomic_physics/ions/ba135.py
index e168be6..c55844e 100644
--- a/atomic_physics/ions/ba135.py
+++ b/atomic_physics/ions/ba135.py
@@ -9,7 +9,8 @@
 
 References:
 [1] - A. Kramida, NIST Atomic Spectra Database (ver. 5.9) (2021)
-[2] - A. A. Madej and J. D. Sankey, Phys. Rev. A 41, 2621, (1990)
+[2] - Zhiqiang Zhang, K. J. Arnold, S. R. Chanu, R. Kaewuam,
+ M. S. Safronova, and M. D. Barrett Phys. Rev. A 101, 062515 (2020)
 [3] - N. Yu, W. Nagourney, and H. Dehmelt, Phys. Rev. Lett. 78, 4898 (1997)
 [4] - N. J. Stone, Table of nuclear magnetic dipole and electric
   quadrupole moments, Atomic Data and Nuclear Data Tables, Volume 90,
@@ -113,7 +114,7 @@ def __init__(
             "1762": ap.Transition(
                 lower=S12,
                 upper=D52,
-                A=29e-3,  # [2]
+                A=1 / 30.14,  # [2]
                 freq=2 * np.pi * 170126433920822.06,
             ),
             "2051": ap.Transition(
diff --git a/atomic_physics/ions/ba137.py b/atomic_physics/ions/ba137.py
index 49bcde4..ad7e85a 100644
--- a/atomic_physics/ions/ba137.py
+++ b/atomic_physics/ions/ba137.py
@@ -9,7 +9,8 @@
 
 References:
 [1] - A. Kramida, NIST Atomic Spectra Database (ver. 5.9) (2021)
-[2] - A. A. Madej and J. D. Sankey, Phys. Rev. A 41, 2621 (1990)
+[2] - Zhiqiang Zhang, K. J. Arnold, S. R. Chanu, R. Kaewuam,
+ M. S. Safronova, and M. D. Barrett Phys. Rev. A 101, 062515 (2020)
 [3] - N. Yu, W. Nagourney, and H. Dehmelt, Phys. Rev. Lett. 78, 4898 (1997)
 [4] - N. J. Stone, Table of nuclear magnetic dipole and electric
   quadrupole moments, Atomic Data and Nuclear Data Tables, Volume 90,
@@ -113,7 +114,7 @@ def __init__(
             "1762": ap.Transition(
                 lower=S12,
                 upper=D52,
-                A=29e-3,  # [2]
+                A=1 / 30.14,  # [2]
                 freq=2 * np.pi * 170126433920821.75,
             ),
             "2051": ap.Transition(
diff --git a/atomic_physics/ions/ba138.py b/atomic_physics/ions/ba138.py
index 5240681..69f7524 100644
--- a/atomic_physics/ions/ba138.py
+++ b/atomic_physics/ions/ba138.py
@@ -7,9 +7,10 @@
 
 References:
 [1] - A. Kramida, NIST Atomic Spectra Database (ver. 5.9) (2021)
-[2] - A. A. Madej and J. D. Sankey, Phys. Rev. A 41, 2621, (1990)
+[2] - Zhiqiang Zhang, K. J. Arnold, S. R. Chanu, R. Kaewuam,
+ M. S. Safronova, and M. D. Barrett Phys. Rev. A 101, 062515 (2020)
 [3] - N. Yu, W. Nagourney, and H. Dehmelt, Phys. Rev. Lett. 78, 4898 (1997)
- """
+"""
 import numpy as np
 import atomic_physics as ap
 
@@ -71,7 +72,7 @@ def __init__(self, *, B=None, level_filter=None):
             "1762": ap.Transition(
                 lower=S12,
                 upper=D52,
-                A=29e-3,  # [2]
+                A=1 / 30.14,  # [2]
                 freq=2 * np.pi * 170126433920560.6,
             ),
             "2051": ap.Transition(