WASHINGTON — Having tried without success to unlock frozen credit markets, the Treasury Department is considering taking ownership stakes in many U.S. banks to try to restore confidence in the financial system, according to government officials.

Treasury officials say the just-passed $700 billion bailout bill gives them the authority to inject cash directly into banks that request it. Such a move would quickly strengthen banks' balance sheets and, officials hope, persuade them to resume lending. In return, the law gives the Treasury the right to take ownership positions in banks, including healthy ones.

The Treasury plan, while in the preliminary stages, resembles one in Britain. Under that plan announced Wednesday, the British government would offer banks like the Royal Bank of Scotland, Barclays and HSBC Holdings up to $87 billion to shore up their capital in exchange for preference shares. It also would provide a guarantee of about $430 billion to help banks refinance debt.

This new interest in direct investment in banks comes after yet another tumultuous day in which the Federal Reserve and five other central banks marshaled their combined firepower to cut interest rates but failed to stanch the global financial panic.

In a coordinated action Wednesday, the central banks reduced their benchmark interest rates by one-half percentage point. On top of that, the Bank of England announced its plan to nationalize part of the British banking system and devote almost $500 billion to guarantee financial transactions between banks.

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The coordinated rate cut was unprecedented and surprising. Never before has the Fed issued an announcement on interest rates jointly with another central bank, let alone five other central banks, including the People's Bank of China.

Yet the world's financial markets hardly seemed comforted. Credit markets Wednesday remained almost as stalled as the day before. Stock prices, which had plunged in Europe and Asia before the announcement, continued to plummet afterward. And stock prices in the United States went on a roller-coaster ride, at the end of which the Dow Jones industrial average was down 189 points, or 2 percent.

The gloomy market response sent policymakers and outside experts on a scramble for additional remedies to stabilize the banks and reassure investors.

The American recapitalization plan, officials say, has emerged as one of the most favored new options being discussed in Washington and on Wall Street. The appeal is that it would directly address the worries that banks have about lending to one another and to other customers.

The concern is the bailout law calls for limits on executive pay when capital is directly injected into a bank. The law directs Treasury officials to write compensation standards that would discourage executives from taking "unnecessary and excessive risks" and that would allow the government to recover any bonus pay that is based on stated earnings that turn out to be inaccurate. In addition, any bank in which the Treasury holds a stake would be barred from paying its chief executive a "golden parachute" package.

Treasury officials worry that aggressive government purchases, if not done properly, could alarm bank shareholders by appearing to be punitive or could be interpreted by the market as a sign that target banks were failing.

As Washington casts about for Plan B, investors are clamoring for the Fed to lower interest rates to nearly zero. Some also are calling for governments worldwide to provide another round of economic stimulus through expensive public works projects.

Yet behind the scramble for solutions lies a hard reality: The financial crisis has mutated into a global downturn that economists warn will be painful and protracted, and for which there is no quick cure.

"Everyone is conditioned to getting instant relief from the medicine, and that is unrealistic," said Allen Sinai, president of Decision Economics, a forecasting firm in Lexington, Mass. "As hard as it is for investors and jobholders and politicians in an election year, this crisis will not end without a lot more pain."

At a news conference Wednesday, Treasury Secretary Henry Paulson pointedly named the Treasury's new authority to inject capital into institutions as the first in a list of new powers included in the bailout law.

Paulson acknowledged that the flurry of emergency steps had done little to break the cycle of fear and mistrust, and he pleaded for patience.

"Neither the passage of this law nor the implementation of these initiatives will bring an immediate end to the current difficulties," he said.