A pumping mechanism for anomalous microwave absorption in formaldehyde in interstellar space.
Molecular collision pumping mechanism for anomalous microwave absorption by formaldehyde rotational transition in Galaxy dust cloud
Cheung, A. C.↗
SEARCH · Search NASA
Results for “Formaldehyde”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
One-man formaldehyde synthesis system Final report
One man formaldehyde synthesis system
Budininkas, P.↗
Microwave absorption of the 2 sub 12 to 2 sub 11 rotational transition in interstellar formaldehyde
Microwave absorption by rotational transition of interstellar formaldehyde in direction of Sgr B2, Sgr A and W51
Cheung, C.↗
Effects of cross-link density and polymer structure on thermal analysis of phenol-formaldehyde polymers
Polymer structure and cross-link density effects on thermal analysis of phenol-formaldehyde polymers pyrolysis products
Parker, J. A.↗
Observations of interstellar formaldehyde
Rotational transition of interstellar formaldehyde in absorption in direction of galactic and extragalactic objects
Buhl, D.↗
Make sugars from formaldehyde
Formose sugars production from formaldehyde, discussing economic conversion by catalytic reactions
Shapira, J.↗
Precise laboratory measurement of the 4830-MHz formaldehyde rotational transition
Formaldehyde rotational transition hyperfine components measured by molecular beam maser
Thaddeus, P.↗
Formaldehyde absorption coefficients in the vacuum ultraviolet /650 to 1850 angstroms/
Formaldehyde absorption coefficients measured photoelectrically in vacuum UV range
Gentieu, E. P.↗
Synthesis of amino acids by the heating of formaldehyde and ammonia
Amino acids synthesis by formaldehyde-ammonia heating and hydrolysis, simulating reactants in weakly reducing atmosphere at volcanic temperatures
Fox, S. W.↗
Adsorption of formaldehyde by various surfaces during gaseous decontamination
Adsorbed formaldehyde levels from vaporized paraformaldehyde on various surfaces as function of relative humidity and chemical concentration
Braswell, J. R.↗
Observation of 140-GHz formaldehyde line emission from the trapezium region of the Orion nebula
Formaldehyde line emission observed from trapezium H II region of Orion nebula, attributing to 140 GHz rotational transition
Jefferts, K. B.↗
Photolysis of formaldehyde at 1470 and 1236 A
Formaldehyde vapor photodecomposition modes by end product analysis, utilizing mixed isotope, radical scavenger, inert gas pressurization and lamp intensity attenuation
Glicker, S.↗
6-centimeter formaldehyde absorption and emission in the Orion Nebula
Formaldehyde absorption and emission lines in Orion IR nebula, indicating pumping suppression by neutral particle collisions
Kutner, M.↗
Laboratory measurement of the 6-centimeter formaldehyde transitions
Formaldehyde transitions in ground and excited states at 6 cm, attaining line widths and hyperfine structure at 1-3 kHz
Thaddeus, P.↗
Interstellar formaldehyde. I - The collisional pumping mechanism for anomalous 6-centimeter absorption.
Investigation of the quantum mechanics of the collisional pumping process which Townes and Cheung (1969) propose as the cause of 'anomalous' formaldehyde absorption in diffuse dark nebulae discussed by Palmer et al. (1969). Quantum effects are taken into account in an attempt to determine whether such nebulae are likely to provide the physical conditions required for the collisional pumping process.
Thaddeus, P.↗
Laboratory measurement of the 2-centimeter, 2/11/-2/12/ transition of normal formaldehyde and its carbon-13 and oxygen-18 species.
Beam-maser spectrometric measurements to an accuracy of about 100 Hz have been conducted of the 2(11)-2(12) transition for the isotopic species of greatest astronomical interest - i.e., H2CO, H2(13)CO, and H2C(18)O. The samples used were not isotopically enriched, monomeric formaldehyde vapors. For these species, all the coupling constants required to calculate the hyperfine structure of any rotational transition have been determined.
Tucker, K. D.↗
Formaldehyde monitor for automobile exhausts
Device makes use of microwave spectral absorption in low-Q resonant Stark cell, and indications are that ultimate sensitivity of instrument is within 100 parts per billion of formaldehyde. Microwave source is very small and requires only six-volt dc bias for operation. Coarse tuning is accomplished mechanically and fine tuning by adjusting dc-bias voltage.
Easley, W. C.↗
Production of edible carbohydrates from formaldehyde in a spacecraft. pH variations in the calcium hydroxide catalyzed formose reaction
The study of the calcium hydroxide catalyzed condensation of formaldehyde was extended to a batch reactor system. Decreases in pH were observed, often in the acid regime, when using this basic catalyst. This observation was shown to be similar to results obtained by others using less basic catalysts in the batch mode. The relative rates of these reactions are different in a batch reactor than in a continuous stirred tank reactor. This difference in relative rates is due to the fact that at any degree of advancement in the batch system, the products have a history of previous products, pH, and dissolved catalyst. The relative rate differences can be expected to yield a different nature of product sugars for the two types of reactors.
Weiss, A. H.↗