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-rw-r--r--libcrystfel/src/utils.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/libcrystfel/src/utils.h b/libcrystfel/src/utils.h
index 8d5ee479..8c11abd6 100644
--- a/libcrystfel/src/utils.h
+++ b/libcrystfel/src/utils.h
@@ -186,6 +186,12 @@ static inline int within_tolerance(double a, double b, double percent)
/* Joules to eV */
#define J_to_eV(a) ((a)/ELECTRON_CHARGE)
+/* Photon wavelength (m) to energy (eV) */
+#define ph_lambda_to_eV(a) J_to_eV(ph_lambda_to_en(a))
+
+/* Photon energy (eV) to wavelength (m) */
+#define ph_eV_to_lambda(a) ph_en_to_lambda(eV_to_J(a))
+
#define UNUSED __attribute__((unused))