H2CO

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Species data
Common Formula H2CO
Stoichiometric Formula H2CO
Name Formaldehyde
Mass   30.01056 a.m.u
Charge   0
CAS   50-00-0
Inchi InChI=1S/CH2O/c1-2/h1H2
InchiKey WSFSSNUMVMOOMR-UHFFFAOYSA-N
State Ground State
Electronic state

Search all reactions with H2CO

KIDA H2CO

ISM Abundance  
log10 Abundance Reference Source Name Source Type Link
Polarizability  
Definition: total
Value 3): 2.77
Method: Measurements
Origin: Database : NIST COMPUTATIONAL CHEMISTRY COMPARISON AND BENCHMARK DATABASE
Reference:
Dipole moment  
Value (D): 2.39
Method: Calculations
Origin: Bibliography
Reference: Woon, D. E. et al. ;2009;Astrophysical Journal Supplement Series ;185,273-288
Enthalpy of formation  
T (K): 0
Value (kJ.mol-1) : -105.322 ±0.11
Method: Reviews and Evaluations
Origin: Other database
Reference:
T (K): 298
Value (kJ.mol-1) : -109.16 ±0.11
Method: Reviews and Evaluations
Origin: Other database
Reference:
T (K): 298
Value (kJ.mol-1) : -108.7 ±0.5
Method: Measurements
Origin: Other database
Reference:
T (K): 0
Value (kJ.mol-1) : -104.86 ±0.5
Method: Measurements
Origin: Other database
Reference:
Desorption energy  
Emean (K): 4500 ±1350
E min (K): 0
E max (K): 0
Pre-exponential factor (s-1): 0.00E+0
Method: Calculations
Origin: Bibliography
Reference: Wakelam, V. et al. ;2017;ArXiv e-prints;,
Type of surface: H2O
Description: To estimate the unknown binding energies (for most of the radicals for example), we have developed a model founded on the stabilization energy of the complex between the various species and one water molecule. Then, we assume that the binding energy of the species with ASW is proportional to the energy of interaction between this species and one water molecule. To determine the proportionality coefficients, we fit the dependency of the experimental binding energies versus the calculated energies of the complexes for 16 stable molecules. Uncertainties in ED is estimated to be 30%. The preexponential factor is to be computed using the Hasegawa et al. (1992) approximation.
Evaluation:  
Emean (K): 2050
E min (K): 0
E max (K): 0
Pre-exponential factor (s-1): 0.00E+0
Method: Estimation
Origin: Other database
Reference:
Type of surface: H2O
Description: This binding energy was listed in the original OSU gas-grain code from Eric Herbst group in 2006. Energy of HCO+H The pre-exponential factor is not given. It can be computed using the formula given in Hasegawa et al. (1992).
Evaluation:  
Diffusion energy  
E (K): 3000 ±204
Pre-exponential factor (cm2 s-1): 2.20E-1
Method: Measurements
Origin: Bibliography
Reference: Ghesquiere, P. et al. ;2015;Phys. Chem. Chem. Phys.;17, 11455-11468
Substrate: H2O ice / Amorphous
Type of diffusion: Bulk
Description: Arrhenius fit of experimental data for temperatures between 90 and 170K. The pre-exponantiel factor was fixed to 0.22 cm2 s-1.
Evaluation:  
E (K): 1395.2
Pre-exponential factor (cm2 s-1): 6.80E-9
Method: Measurements
Origin: Bibliography
Reference: Mispelaer, F. et al. ;2013;Astronomy & Astrophysics;555, A13
Substrate: H2O ice / Amorphous
Type of diffusion: surface
Description: These data have been obtained by fitting experimental diffusion rates. The diffusion rates (in cm2s-1) as a function of temperature are listed in Table 3 of Mispelear et al. (2013) and are the following between 2e-14 and 8e-14 for H2CO (for temperatures between 110 and 125K).
Evaluation: