Data Item _cell.reciprocal_length_a
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General 
- Item name
- _cell.reciprocal_length_a
- Category name
- cell
- Attribute name
- reciprocal_length_a
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
The reciprocal cell length (recip-a) in inverse angstroms.
(recip-a), (recip-b) and (recip-c) are related to the real cell
by the following equation:
recip-a = b*c*sin(alpha)/V
recip-b = c*a*sin(beta)/V
recip-c = a*b*sin(gamma)/V
where V is the cell volume.
Ref: Buerger, M. J. (1942). X-ray Crystallography, p. 360.
New York: John Wiley & Sons Inc.
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?
- Units
- reciprocal_angstroms
Allowed Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 0.0 | +∞ |
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _cell.reciprocal_length_a_esd | associated_esd |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _cell_reciprocal_length_a | cif_core.dic | 2.3 |