A mechanism for a deployable optical structure of a small satellite

Two-step radical reactions that switch low multiplicity channels leading to the carbene and carbyne species detected for Ru(5F) + CH4−nFn (n = 2–4) interactions under matrix isolation conditions

“…This carbene complex lies 63 kcal mol 21 below the energy of the original reactants Ru + CH 2 F 2 , and it is the most stable structure found for this reaction, which agrees with the experimental data obtained from IR-matrix determinations. 1 It is not expected that the carbyne structure HCMRuHF 2 , also revealed as a product of this reaction, could be attained from the H 2 CLRuF 2 carbene, as the barrier separating the two structures seems too high (36.4 kcal mol 21 ). Instead, the most favorable path leading to the carbyne species involves an intramolecular C-H activation in the inserted intermediate H 2 F-C-Ru-F, which allows for the formation of the trans carbene HFCLRuHF via a nearly barrierless path (Fig.…”

“…Recently, different reactions of halomethanes with naked transition metal atoms have been investigated by matrixisolation infrared (IR) spectroscopy. [1][2][3][4][5][6][7][8][9][10][11] In general, the products detected for these interactions under cryogenic conditions, which include structures arising from the insertion of the metal atom into the C-X bond, methylidene and methylidyne complexes or some mixture thereof, do not match those observed in less constrained media. [12][13][14] For example, Soorkia et al have studied the Zr + CH 3 F reaction within a supersonic expansion.…”

“…[15][16][17][18][19] Experimentally, the reactions of laser-ablated ruthenium atoms with the CH 2 F 2 and CF 4 compounds have been analyzed by Cho and Andrews in IR studies on matrix deposition samples. 1 For the first reaction, these authors reported a product distribution consisting of methylidene and methylidyne complexes. For the second reaction, only the carbene species was detected.…”

Design, fabrication, and evaluation of a passive deployment mechanism for deployable space telescope

“…In case of the machining and assembly errors, they are assumed to be identical regardless of scale of the model. The simulation results for the basic model reported in the previous article 18 and the improved models (quarter, half, and full model) with a customized apparatus (i.e. customized linkage, supporting module, and assembly jig) are shown in Table 3.…”

“…In the previous study, we presented a simple deployable mechanism and confirmed the alignment errors using the six-axis touch probing-based measurement device. 18 However, the reported alignment errors were too large to apply in deployable space telescope even with additional focusing mechanism. In this article, therefore, we design, fabricate, and evaluate a high precise deployment mechanism for a Cassegrain-type deployable space telescope to realize 1-m ground resolution.…”