Table 2: Infrared absorption bands and assignments of the products formed from a binary NH₃:CO₂=1:1.
Assignment Wavenumbers Band Strength

(cm^-1) (cm molecule^-1)

$\nu$ (NH₂) NH₂COOH dimer 3462

$\nu$ (NH₂) [NH₂COO^-][NH₄⁺]

$\nu$ (NH₂) [NH₂COO^-][NH₄⁺] 3325

$\nu$ (OH) NH₂COOH dimer (broad) 3140

$\nu$ (C=O) NH₂COOH dimer 1691 $5\times10^{-18}$

$\delta$ (NH₂) [NH₂COO^-][NH₄⁺] 1623 $2\times10^{-18}$

$\nu_{\rm as}$ (COO^-) [NH₂COO^-][NH₄⁺] 1553 $2\times10^{-17}$

$\delta$ (NH₄⁺) [NH₂COO^-][NH₄⁺] 1495 $3\times10^{-18}$

NH₂COOH dimer 1451 $2\times10^{-18}$

$\nu_{\rm s}$ (COO^-) [NH₂COO^-][NH₄⁺] 1393 $8\times10^{-18}$

NH₂COOH dimer 1320 $2\times10^{-18}$

$\nu$ (CN) [NH₂COO^-][NH₄⁺] 1117 $4\times10^{-18}$

$\rho$ (NH₂) [NH₂COO^-][NH₄⁺] 1037 $2\times10^{-19}$

$\delta_{\rm oop}$ (OCN) [NH₂COO^-][NH₄⁺] 829 $6\times10^{-19}$

$\delta$ (COO^-) [NH₂COO^-][NH₄⁺] 674 $4\times10^{-19}$

Vibration mode: stretching ( $\nu$ ), bending ( $\delta$ ), rocking ( $\rho$ ), torsion ( $\tau$ ).
Indication: asymmetric (as), symmetric (s) and out-of-plane (oop).

**Table 2:** Infrared absorption bands and assignments of the products formed from a binary NH₃:CO₂=1:1.
Assignment	Wavenumbers	Band Strength
	(cm^-1)	(cm molecule^-1)
$\nu$ (NH₂) NH₂COOH dimer	3462
$\nu$ (NH₂) [NH₂COO^-][NH₄⁺]
$\nu$ (NH₂) [NH₂COO^-][NH₄⁺]	3325
$\nu$ (OH) NH₂COOH dimer	(broad) 3140
$\nu$ (C=O) NH₂COOH dimer	1691	$5\times10^{-18}$
$\delta$ (NH₂) [NH₂COO^-][NH₄⁺]	1623	$2\times10^{-18}$
$\nu_{\rm as}$ (COO^-) [NH₂COO^-][NH₄⁺]	1553	$2\times10^{-17}$
$\delta$ (NH₄⁺) [NH₂COO^-][NH₄⁺]	1495	$3\times10^{-18}$
NH₂COOH dimer	1451	$2\times10^{-18}$
$\nu_{\rm s}$ (COO^-) [NH₂COO^-][NH₄⁺]	1393	$8\times10^{-18}$
NH₂COOH dimer	1320	$2\times10^{-18}$
$\nu$ (CN) [NH₂COO^-][NH₄⁺]	1117	$4\times10^{-18}$
$\rho$ (NH₂) [NH₂COO^-][NH₄⁺]	1037	$2\times10^{-19}$
$\delta_{\rm oop}$ (OCN) [NH₂COO^-][NH₄⁺]	829	$6\times10^{-19}$
$\delta$ (COO^-) [NH₂COO^-][NH₄⁺]	674	$4\times10^{-19}$

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