d15n_alpha_n2o¶
Properties¶
- dimensions:
N_PROF, N_LEVELS
- dtype:
float64
Default Attributes¶
Attribute |
Value |
|---|---|
|
|
|
|
|
|
|
|
|
|
Description¶
Enrichment of :sup:15\ N vs :sup:14\ N in N2O (nitrous oxide) where the substitution has occurred at the center position of the N2O molecule as compared to a standard. N2O where the substitution has occurred in the end nitrogen atom is called D15N_BETA and is not usually measured. D15N_BETA can be calculated from bulk D15N and D15N_ALPHA using equation 25 from Toyoda and Yoshida 1999 [Toyoda1999]_
.. math::
\delta^{15}\text{N}^\beta = \delta^{15}\text{N}^\text{bulk} + A( \delta^{15}\text{N}^\text{bulk} - \delta^{15}\text{N}^\alpha)/(2-A)
Toyoda and Yoshida give the value of A=0.998, though this needs to be determined experimentally for the standard in use. We have seen data using a value of A=1 in data submitted to CCHDO.
.. [Toyoda1999] Determination of Nitrogen Isotopomers of Nitrous Oxide on a Modified Isotope Ratio Mass Spectrometer; Sakae Toyoda and Naohiro Yoshida; Analytical Chemistry 1999 71 (20), 4711-4718; DOI: 10.1021/ac9904563